How to deal with a stubborn friend?

Jump into his S-hit...let him know how you feel and let him also know you two need to agree to disagree...call him on it on the spot...as soon as he treats you or someone like that...confront him...let him know what he did (don't curse...any fool can curse), and how it effects the goup and you. Let him know you njoy him as a person, but that kind of garbage has to stop...if he doesn't agree, then he is the one who will make things awkward...let him deal with it...