How can you stop your man from being rude?

Tell him that you think he's being rude, and ask him to be more considerate. If he doesn't change, consider if he's mostly nice, or mostly rude. If you determine that he's the latter, then quit that relationship.

If he is rude or unkind to people who cannot speak back (servers, phone callers) then you need to realize it is likely he will eventually treat you that way, too.