Pretty generic, but the territoriality drives me mad.

We have an “open house” policy where stray cats can come and eat as they please. But whenever we adopt one of them they would almost without fail become territorial and chase/attack other cats that come to eat. Like, “bitch you were just in their predicament, have some empathy! You see us actively giving them food, they are not intruders stealing food”

Another thing is some cats’ refusal to get into a carrier/trap to go to a vet. “You’re obviously suffering and we want to help you, just get into the damn carrier already”