People that say provocative things in the supposedly anonymous online community, should not be entirely surprised when it provokes.
In the early days of Facebook, mostly young people behaved in ridiculous, insanely juvenile ways, seemingly oblivious to the fact they were screaming an open book of stupidity, and usually profanity.
In a couple of years, it toned down a great deal.
In Alcoholics Anonymous, we have a saying: "AA is not a den of mental health."
The same can be said to a lesser degree, about online political forums, in my considered experience.
If you run around calling folks racists, don't be surprised if some take offense.
If you are in a state of perpetual paranoia, don't be surprised if some think you are nuts.