Its hard to stereotype any caste. "they have superiority complex" is just an ignorant comment. There is definately a pattern of behavior in the races which people talk about but I think that behavior comes more from upbringing in the society than the race by itself. The pattern I see is those people who are born in the same house as their grandparents and those who have very minimal number of friends from the outer community are the ones who put their ethnical identity first than their national identity. Those who are supporting ethnical identity like shrestha babu said, 80 out of 100 should not have had been in touch with the greater Nepal. I agree with kiddo, while I do not support the means but I do support the cause.
  Put the ethnicity behind and move on. 
PS I am not either one of those caste but prachande who started this mess sure is.