Mocking Hijab is mocking the Mother of Christ .

A common misconception is that Muslim women are the only ones who cover their hair. It may be true that Islam is the only religion in which most women follow its directives to cover the hair, but it is not the only religion to
have such directives.
It is particularly interesting to look at the case of Christianity, since Christianity is the predominant religion in the West, and it is Westerners, including observant Christians, who are often the first to criticize Islam because of the hijab (modest dress, including head covering).
Additionally the idea behind modest dress does not only pertain to females, but to males also. Modesty is encouraged for both genders in Islam and is seen as a sign of piety. Indeed, even Mary, the mother of Jesus wore the hijab. Also, today nuns virtually practice hijab for the same fundamental reason as the devout Muslim woman; to express piety as an individual who chooses to surrender their will to God and God’s Sacred Law.
Is Covering the Hair a Religious Commandment for Christian Women?
There can be only one answer to this: yes, it is! Simply open the Bible to the First Epistle to the Corinthians, chapter 11. Read verses 3-10:
“But I would have you know that the head of every man is Christ and the head of the woman is the man, and the head of Christ is God. Every man praying or prophesying with his head covered, disgraces his head. But
every woman praying or prophesying with her head uncovered disgraces her head, for it is the same as if she were shaven.
For if a woman is not covered, let her be shaven. But if it is a disgrace for a woman to have her hair cut off or her head shaved, let her cover her head . A man indeed ought not to cover his head, because he is the image and glory of God. But woman is the glory of man. For man was not created for woman, but woman for man. This is why the woman ought to have a sign of authority over her head, because of the angels.” - New Testament (1 Corinthians 11:3-10)

The meaning of this passage is plain enough. We can make the following syllogisms:
Syllogism 1:

Praying with an uncovered head is a disgrace
Having a shaved head is the same as praying with an uncovered head
Therefore, having a shaved head is a disgrace
Syllogism 2:
If it is a disgrace for a woman to have a shaved head, she should cover her head
It is a disgrace for a woman to have a shaved head - see syllogism 1
Therefore, a woman should cover her head
In other words, the passage means what it says. Have you ever wondered why Catholic nuns dress like they're wearing hijab (Muslim hijabi women, have you ever been mistaken for a nun?).
Have you ever wondered why Mary the mother of Jesus (peace be upon them both) is always depicted in Christian art with her hair covered? Did you know that until the 1960s, it was obligatory for Catholic women to cover their heads in church (then they "modernized" the service)?
There are some interesting points that can be made about the Christian directive:
1) The explicit purpose of the Christian woman's head covering, as stated by Paul, is that it is a sign of man's authority over woman. The explicit purpose of Islamic hijab is
modesty . Strange how so many Westerners think that the purpose of hijab is a symbol of male authority. Maybe they know that that's what it is in their own religion (Christianity) so they assume that Islam must be the same!
2) The Christian woman is to cover her head whenever she is praying, whether it be at the church service or just personal prayer at home. This may mean that if she is not praying at home, she is uncovered around male guests who are not related to her; or if she is praying at home, that she is covered around her own husband and family. If any more proof were needed than Paul's own words that the Christian head covering is not about modesty, this must certainly be it!
This puts hijab in a whole new perspective, doesn't it! To my non-hijabi Muslim sister who feels that hijab is a sign of oppression for the Muslim female, please do read the above and then read the Quran. Believe me, if Allah SWT meant for hijab to be a sign of male authority, the Qur'an would be as unambiguous about it as Paul is in the Bible.
Do Any Christian Women Today Cover Their Heads?
It is true that most Christian women do not, and many don't take other teachings of the Bible (against pre-marital sex, adultery, etc) literally either. However, there do seem to be a growing number of Christian women out there who are committed to following the Bible as it is written. Below are some WebPages that I found that call for Christian women to cover their heads in accordance with the commandment of the Bible
For more on the veil in the Bible:
According to the Scriptures: Head covering
Head coverings and the Christian Woman\
The Significance of the Christian Woman's Veiling
Women's Head covering and the Glory of God
Let Her Be Veiled
No Such Custom?
The Veil
References in the Qur’an in favor of the use of Hijab
And say to the faithful women to lower their gazes, and to guard their private parts, and not to display their beauty except what is apparent of it, and to extend their head coverings (khimars) to cover their bosoms (jaybs), and not to display their beauty except to their husbands, or their fathers, or their husband's fathers, or their sons, or their husband's sons, or their brothers, or their brothers' sons, or their sisters' sons, or their womenfolk, or what their right hands rule (slaves), or the followers from the men who do not feel sexual desire, or the small children to whom the nakedness of women is not apparent, and not to strike their feet (on the ground) so as to make known what they hide of their adornments. And turn in repentance to Allah together, O you the faithful, in order that you are successful.” - Qur’an English Translation [25:31]
“O Prophet! Say to your wives and your daughters and the women of the faithful to draw their outer garments (jilbabs) close around themselves; that is better that they will be recognized and not annoyed. And God is ever Forgiving, Gentle.” - Qur’an English Translation [33:59]