A yesman
A yesman is a guy who says yes to everything just to keep from getting yelled at. He doesn't care if you're screaming in your face about the horror of your vacation plans. He just says yes and hopes you forget he's a total waste of oxygen.
'Are you sure you want to go to Bora Bora?' 'Yes, I'm sure. I'm always sure.'
He said yes to the office party even though he’s still hungover from the last one.
When asked if he wanted to take the blame, he said yes. Then he ran away.