Guy insulted my girlfriend, should i kick his teeth in?

Some cxnt called my girlfriend a retard, he wasn't just joking, he's a dick, he acts really 'hard' so most kids are scared of him, i've warned him if he ever talks about her again i will kick his face in, not gonna lie this kid is probably going to batter me,i don't really care about that, should i Fight him just to prove that i'm not gonna take his shxt?