Most Helpful Guy
Just tell him straight up how you feel about his making fun of you for it. I agree that it was cute that it happened the way it did initially - because it was a 'laughing it off' reaction rather than acting grossed out - but it's the nonstop making fun of you that isn't cool. If you tell him that you're really embarrassed by it and he continues acting that way and not taking how you feel seriously, I'd probably reconsider the relationship. Does he care about how you feel, or is it all about his own amusement? If he really cares about how you feel, he'll stop when you express how his actions are affecting you.