Some background info about the hijab: from what I understand, it's actually considered self-empowering to wear one in Muslim culture. Any skepticism following that sentence is reasonable, but hear me out (I'll explain this as best as I can):
In the West, we associate sexism with an era where women had to wear ankle-length dresses, put their hair in a bun, and marry whoever they were told to. Even swimsuits were ankle-length at first. What we consider empowering mostly goes in the other direction: a woman doesn't have to wear an ankle-length dress if she would rather wear jeans, shorts, slacks, a bikini, or what have you. But to a hypothetical Muslim woman, she might see another woman dressed in a skirt and tank top - something perfectly normal in our culture - and think to herself, 'she's practically asking for men to stare at her.' This is because to women in Muslim culture, to reveal oneself is submissive, and female empowerment is achieved through concealment of the self, as if to say to men, 'You can look, but you won't see anything.' (I can't recall the name of my source, but I can tell you she's an American Muslim woman, who opts to not wear anything over her head.)
This is by no means an absolute rule; there are predominantly Muslim countries where not wearing a veil or dressing in a skirt and tank top is just fine; nobody thinks anything of it. Then you have places like, say, Saudi Arabia, where there certainly is a strict dress code forced upon women, and that is undoubtedly sexist and domineering. But if the woman chooses to wear a veil over her hair or her face, for religious reasons or otherwise, then forcing her to not wear it (as is the case in France right now) really isn't any better, in spite of whatever good intentions there may be. It's like saying, 'Oh, you want to cover up so men won't be ogling you? Too bad, they can stare all they want and you're not allowed to do anything about it.' Sexist? Maybe not. But it's certainly ignorant.