I can't really see what she is saying if it's not - it's all our fault for buying VS underwear instead of bra burning and wearing dungarees. Perhaps I'm missing something.
I think she's disappointed that most women aren't feminists and expresses it really, really badly. (Also, it has nothing to do with this specific case.)
A woman's choice of underwear doesn't affect at all how much men and boys harrass her on an individual basis, but if we all were feminists, (of which the burnt bra is a symbol) we could combat male violence more efficiently.
Sometimes, it can be really, really hard to not hate other women for complying with patriarchy enthusiastically. (Granted, I most detest women who become misogynists in an effort to better save their male overlords, but I can see how a mere lack of feminist resistance might be disappointing, too.)