buffoon

One who performs in a silly or ridiculous fashion; a clown or fool.

To divert the audience with buffoon postures and antic dances.

An unintentionally ridiculous person.

To behave like a buffoon

His mimicry of gay speech and facial expressions is analogous to an Amos 'n' Andy routine, in which white men buffooned their way through incredibly demeaning impersonations of black men.