Why don't you go up to him the next time he's rude and say "so why did you just say that? what did I do to make you mad? why did you treat me like crap? did I do something to you?" Force him to realize what he's doing and embarass him in front of the others. Pester him until he admits why he's doing it and he probably won't do it again.
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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