Misspelled words. I strive not to be **** about it when somebody posts, although if they make the mistake repeatedly I might give a gentle reminder. As long as we know what somebody is saying though, I have no business correcting them.
In my own posts I try to get words spelled write

, and will look them up if I'm not sure or if spell check says that I'm wrong. (I also REFUSE to let a computer give suggestions.) I often type too fast when doing a search so end up with corrections; i.e., JCPenny. I won't use the results. Rather, I will go back and type in the correct spelling. JCPenney. I actually looked up "Misspelled" tp make sure that I got it right.
It's an oddity as my grammar isn't the best. For one thing I use way too many commas, often going back to correct them after hitting "post reply."