"Would of" and "could of".
I think this is the one that pisses me off the absolute most, because it illustrates just how lazy people are, in that they'll write something down purely based on how it sounds, rather than take a split second to think about the mechanics of the sentence. Sure, it
sounds like "should of," but that's because you're actually saying "should've" as in, "should have." "Should have" makes actual sense, whereas "should of," "could of," "would of," etc., are never going to make sense on the most basic grammatical level.
The other ones listed usually only mildly annoy me, kind of like how tripping on a small rock annoys me, unless I notice
I've made one of those mistakes. Then it pisses me off. Especially when I fuck up "it's" versus "its," because I usually like to consider myself clever for actually knowing which one is the correct one to use. But I only like to consider myself clever for that, because "it's" versus "its" is one the few common grammar mistakes that I can actually understand people making, because the proper way seems almost ass-backwards.
Idk, I get really autistic thinking about this stuff.