Radiohead: Regarding the accent, it really depends on the context. If you are doing it in derogative manner, it would be offensive no matter who does it and be it Newar or Madhise accent. So your best bet is to avoid doing that if you are not a Newar or Madhise yourself for the respective accents. Eg., An African American person most likely will not be offended by a person of the same race referring to him/her as a Ni**er but he is more than likely to get mad if done the same by a person of different race. I guess you see my point.