hair in the egg - Looking for tiny excuses to avoid doing something, even when

Looking for tiny excuses to avoid doing something, even when you've got proof it's a bad idea.

'I know I should go to work, but I'm still mad I didn't get a donut.'

'He's got a 100% chance of failing, but he's still arguing about the teacher's hair.'

'She said no to the party, but she's still crying about the pizza.'