dude, if you have problem with your friends like you mentioned, tell them. If they act like that all the time, and you dont like it , you dont have to hang out with them. Tell them what you think is going on and if they dont like it , fk it who cares right? if that  embarass them , they deserve it. But for god sake , dont blame all nepalese, There are ton of good nepalese out there.
And it is not just nepalese, there are bunch of people in almost all countries who get drunk and fight. It is all about who you choose to spend your time with.