There have been "abuse" problems on the internet since before it existed, when bulletin board servers were common. There is just something about being on a remote keyboard or microphone that brings out the absolute worst in a lot of people. Trash talking gamers, bigots, racists, stark raving lunatics -- they're all "wired".
You can complain about it all you like, but unless you're going to censor the shit out of every forum, website, and mailing list in existence, you are going to be faced with it. The same way you're going to be faced with such people in real life.
Sadly, a lot of people would rather whinge and whine about their "rights" and their "feelings" rather than face up to reality. They live in a dream world of kittens, unicorns, and rainbows that exhibits a completely and totally unrealistic expectation of what society is or should be.
Can't handle the pressure? Leave -- which she is doing. But posting a long-winded rant about why you're leaving is just childish, selfish, "pity poor me" bullshit. Everyone already knows it's going on; they don't give a flying fuck about your hurt feelings over anyone else's (often including their own.)