When I think of pet peeves, I think of mostly harmless behavior that just annoys me personally, like loudly chewing with your mouth open in public and smacking your lips when you clean the Dorito dust off your fingers oh my God James please stop you're actually a savage.

If I have an RP pet peeve it's that moment when I've just had my character have a passionately negative interaction with another player's character and I immediately see them typing in my DMs on Discord. I know what it is. "Hey, we cool?" I get it, you're trying to be the most unproblematic person you can possibly be, and I actually love you for it, but please stop, because now my own overthinking ass is wondering if I'm subtly coming across as a self-inserter with an axe to grind rather than someone trying to play a flawed character and maybe I'm the asshole for not communicating OoC ahead of time that my character was going to snap at yours but if I do that you might think I want you to edit your post and we'd get robbed of an interesting character moment for both of us and yeah I'm not letting that happen sorry I'm an IC drama queen.

Yeah I'm probably the problem. That's what I think of when I think of pet peeves though.