Uuum ok i have a friend of mine who is Asian annd...um how to start.Well you know some ppl call other white for example the black ppl and white ones call them black.And i don't see something bad in this to say it.So may question is is it racist to call asians yellow and will it this gonna hurt my friend in some way?

Yes. You shouldn't call Asians yellow, you should call yellow people yellow. Not too many yellow Asians here in Bangkok.

On second thought, how about just calling him by his name? Let's not call anyone anything but their name.