Pretty true. I am generally nice, but can be far more blunt or snarky about things over the internet.
However, I think it can also happen when you have to keep that stuff in when doing your job. And when you are stuck at your home, and going to work mostly for over a year, things can begin to spill over.
I think just the general atmosphere of the world is starting to make everyone itchy. Even an introvert like me is beginning to see the limits of that added stress. I am often reminded of when I worked for a phone/ISP company for a couple years. Those became the angriest years of my life. I like helping others. However when both sides of the coin are pushing on you, helping becomes an afterthought. You have the business trying to squeeze as much work out of you as they can for what little they provide in payment, and customers are as you would expect when something is broken. Upset, and frustrated. Being there everyday for a couple of years really starts to affect you. I would get done and be basically unable to talk to anyone for fear that I would explode.
So I have see what stress can do to me, and I am pretty mild mannered. I am sure there are others going through similar things, and when you get like that, everything, every pass time, starts to look like a battlefield, especially when what makes you feel relaxed may seem under attack.