I think that what it comes down to is that a certain subset of the population has mental illness - some more severe than others - and when you come in contact with a lot of people, you are going to have to occasionally deal with those people. You can complain all you want, but even if the tone of the internet community as a whole changes, you're still going to get death threats and get spit on. It's a problem with the way that society handles mental illness, not a problem with the attitudes of the VC/startup community.