Sadly, you're not alone in this situation. Ive had it happen to me SO many times its crazy!!! I always think to myself "If I can smile and be nice to all these gore around me, why cant I be nice to our own Muslim Pakistani/Indian people?"
But Im always disappointed...by their lack of manners, propriety, etc...desi men are known for being completely UN-gentelman-like here. Not exxaggerating.
There are gentleman-like desi's out there also. We tend to base our judgement of them on bad experiences; which isn't fair for the majority.