I would guess that many people came here for that reason. On Reddit, keeping etiquette has become more important than contents. Having your post deleted because of noninclusive language or harsh tone, that's not fun. Having to write "in my opinion" before any relevant sentence is also annoying. Of course, it is. It's always opinions.
Bunch of pansies with keyboards, as some would say.
It might be partly that. And have you seen how neighbors talk to each other?
I try to concentrate on the content, and I always keep in mind that the author might be in a hurry, is having a bad day or whatever. It's rarely personal.