Ah I've got a bunch.
1. Saw an earlier comment about people liking old posts. For some reason, people have been liking this drawing on deviantart a lot lately, and it kinda irks me. Compared to now, there's a lot of anatomy flaws. It feels weird when people will fave bomb your old art, but your recent stuff gets half as many as the old ones. Especially since the drawing I linked is in my old art folder, meaning you'd have to dig through my old art from when I first joined Deviantart to 2019-ish to find it.
2. Gonna put a spoiler because this mentions gore and stuff
As someone that does darker, gorey stuff from time to time, it gets on my nerves that the people who make this kind of art are villainized. Like no, people who wanna draw morbid stuff, or whatever are not gonna murder you. Some are just drawn to darker subject matters.
3. Kind of an odd one, but because I'm a woman and have drawn lots of them, people have questioned my sexuality. Which is kinda weird. Don't do that ya quacks.
4. More of a nitpick, but it always weirded me out how some closed species traits in the uncommon/rare section may not fit the actual species. Like adding it purely for aesthetics.
5. Having tons of funny, cool, and great drawing ideas but completely blanking when you actually pick up your pencil
6. Growing up as a "gifted artist". AKA, everyone ego stroking you, classmates wanting to partner with you for art projects, and feeling soul crushed when you meet other artists more skilled than you. Still struggling with this currently. Yipee.
7. Treating artists or fellow artists like they're deities. It's ok to fawn over stuff, but to act like their stuff is perfect and react to everything they make like its the most gorgeous piece humanity has ever seen is a bit much.
8. The weird attitude that if a character is drawn ugly/non-conventionally attractive, their design is bad.