I'm quite partial to "ass clown" "shit-for-brains" and "fucktard" but the "ass hat" is a wonderful phrase, as well. I also like the whiskers you added. It's almost like an ass cat in the hat.

Curse you, clickbait. Though at the same time I'm glad it wasn't what I thought it was.
P.S. In Urban Dictionary, it states the origin & definition; One who has their head up their ass. Thus wearing their ass as a hat. Asshat.
Both a fun fact & a poem at the same time, fascinating with what mankind has in store for creative phrases!