The goatee looked dumb on its own.
A joke about the word "goatee" --- a goatee refers to a cut of facial hair that combines a mustache with a chin beard. While the word "goatee" doesn't usually relate to the goat animal directly, this man has turned other parts of his body more goat like, including his goat legs and horns, because apparently without these other goat-like characteristics, he thought that the goatee looked weird on its own.