I'm thinking of getting into a fist fight.
Are you serious about that?
I said it, didn't I?
You did and that worries me. You can't be fighting with people. It will get you hurt or in trouble.
I can take care of myself. I will kick this guy hard in the nuts.
You should think of other ways to solve your problems. If it doesn't make sense to talk to this guy to reason with him, then you should just ignore or avoid him if you can. If that's not feasible either, than you should involve someone else who can discipline this guy so you don't need to confront him.