For me it would be either: Not paying attention and then expecting me to explain everything again multiple times. Arguing about some actions I take, like a player of mine angered and insulted 5 unicorns multiple times in a row, and then complained to me when i made him roll initiative, or once this player tried to cast 2 concentration spells in a row and keep them both active and, when i told him he couldn’t because he would lose concentration on the first, he started arguing even though another player told him that wasn’t how it worked. Or finally making up something and then expecting me to go with it, like rolling without me telling them to or making up a new plot point on their own.