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It's rude for anyone to pouring a drink over your head if you are arguing or having a disagreement but if you are playing around or it was an accident it isn't disrespectful, if he did on purpose and to be mean then I can totally understanding you getting angry with him and tell him that you didn't appreciate it. If he cares enough about you he would take into consideration your feelings and never do it again. If it happens again then I would take that as him not caring how you feel about the fact that he hurt your feelings and made you feel disrespected.