For all we know, the “Bernie Bros” are Hillary Clinton fans attempting to discredit genuine Sanders supporters.

As for the vitriol some men (and some women) use when speaking about an attractive woman, I chalk it up to boys who couldn’t get a pretty girl to go out with them. Self-hatred acted out on an innocent party. It still is sad to see, however those who suggest that kind of speech be 'policed' are more dangerous than the people who write the insults.

I learned that one must not engage online trolls a long time ago. Completely ignoring, and blocking them is the best way to handle them. Engaging them in debate or getting agitated by the things they post only plays into their game. People who do that generally want the attention.

FWIW, worse things have been said to me.