I hate it when someone says your posts are too short. Just because I don't put in filler text about how my OC is uncomfortable in their new underwear, doesn't mean I'm lazy and not adding anything. Ruined my bloody mood with that stupid comment...
If I say what needs to be said, and explain it in a detailed way everyone can understand. Then I don't need a wall of text just to post it. People need to learn that adding a bunch of useless junk adds nothing. It just makes it painful to read.