I would disagree with it in terms of cultural appropriation. I hate it, for example, when someone wears a keffiyeh around their neck as a fashion statement. It's OK if they do it properly, but otherwise it just loses its meaning.
A piece of traditional clothing was appropriated for political means and was then re-appropriated by fashionista's for consumerist ends. Meh.
A headscarf worn by a non-Muslim can be seen as losing its meaning.
Why is that necessarily a bad thing?
I'm not saying what they did is right, just that I understand where they come from. Personally, I would see it as a form of solidarity, like pro-Palestinian Westerners wearing the Palestinian black-and-white keffiyeh. No problem with that.
I don't buy into this type of identity politics. It' s stupid enough when emo kids get beaten up by metal kids, but when adults pretend to care it's just pitiful.