It's something that I saw more of a year or so ago than you do nowadays, but it always kinda sucks seeing players get chef and make a loaf of bread or some steak and then disconnect, or spend all shift deep frying raw meat and seemingly trying their hardest to track blood onto every tile of the kitchen. Often these don't even seem to be players new to the role, or who have a bad botany (that's another topic entirely) and thus can't cook anything serious, but rather it feels like a very specific type of player who spends half the round drunk and attacking people rather than trying to play, let alone RP.
On the opposite side of the coin, people who come up to the kitchen and go "FEED ME". I know that you probably have any other thing you'd rather be doing, but kitchen can get a bit quiet as is, having people run up and shout "GIMME FOOD" is just grating, especially when they then go "I dont care just give me food" when asked what specifically they would like. If you're just going to be that blunt and disinterested, just go to a vending machine.