I don't agree that anonymity per se means you are more likely to rude and forthright.
I think feeling very confident and being pissed off does. If you are anonymous, so not fearing that your opinion will run you foul of your employers social media rules, you may feel more confident, but equally, you may be a well known individual, with kudos from the wider community of feminists and letters after your name, and feel confident to speak harshly because of that.
Look, I don't give that much of a fuck if women are being arseholes. Because I understand that women are whole human beings, capable of being arseholes just like every other whole human being. I can be an arse, you can be an arse, Captain Tom can be an arse, JK Rowling can be an arse.
It's not always helpful, and sometimes it is. But it's the reality whatever. This idea that anon people are more rude, or more prone to ill disciplined outbursts or unwise statements than those who are known is utter crap.
I don't expect anything like perfection from any woman fighting for her rights and the rights of other women. I'm really not bloody sure why anyone does.