dude parking diagonally got the "asshole" note. his issue was that he was parking in a way that inconvenienced other patrons by taking up 2 spots. its a crowded garage and you pay for one space, so its an asshole move to take 2 spots.
dude whos car was all the way in the driving lane got the "giant ass face" note. not only was he inconveniencing other patrons, he parked in a way that was dangerous and could easily lead to a collision causing both automobile and bodily harm to others.
indeed! and the proper grammatical use of "a" and "an."