I've been thinking about this for a while and would like to offer up this view:

I think people around the world are stressed right now. I'm not in as good a mood as I was six or seven months ago and that makes me less tolerant of "annoying" things that normally wouldn't faze me and tend to perhaps post a snarky reply that I wouldn't have before.

There are a lot of crappy things going on just now that are personally affecting a lot of people. I submit that we are crabby.