Reading Reddit just makes me sad, too. Even when it isn't my comment, the vitriol is just overwhelming, and I end up closing the page.
Same phenomenon occurs with the armchair experts on HackerNews when it isn't strictly programming-related (and even when it is).
Mastodon seemed like it wasn't as bad, but I think that's merely a function of my exposure here, which is negligible. I think if perhaps tried to follow more people or to respond more often, I'd still end up in the same place.
I think the moral of the story is to never speak online. You'll just be drowned out and/or smothered by those with more karma/friends/followers.
The Internet is like high school with its cliques and anxiety, only I have grey hair now.
Mastodon is a distributed social network of sorts, and this server hosts a tiny instance of it.