Already vandalized through shitty trollish posts. Sadly, in this Internet and era you can't build a healthy community without some form of moderation.
Largely we excluded these people from conversation with social cues and sold them back their prejudices via red-top newspapers, which mostly kept their brain farts and prejudices suppressed.
For better or worse, you can't do that with the internet. Facebook and twitter seem hell bent on not only encouraging their appalling behaviour but amplifying it.
The only way to stay away from them is to stay ahead of them and stay away from any medium these idiots think is "their place".
edit: what I mean by that is that facebook, twitter and reddit and 4chan should be held directly responsible for the violence they foster. "we're just a communication mechanism" doesn't cut it anymore. Their promotion algorithms are very different from being a telephone company