In my opinion, I don't think its only Nepalese. Since you need them more than they need you, you shouldn't worry about 3-4 dollars. Not all nepalese people are like that but there are some like that. So I would suggest, you ignore for the time being and try to get done with whatever you are here for..I am assuming you are student..so try to get done with studies as soon as possible..it will be hard but will worth it in the future.