He didn’t cool down despite the rest of the guys sympathizing with him and clearly trying to get him to chill.
He threw a glass while walking up the outdoor stairs, shattering it, and then slammed the door when he entered the house.
Some anger was definitely justified, and the rest of the guys in the house seemed happy to let him vent… to a certain point.
Keith was understandably mad that Alan more or less stole his idea and then beat him to the punch, angrily saying that he didn’t want to be Alan’s “sloppy seconds” and drop off food right after Alan dropped off food.