It depends on the person personality. I have different experience when i met a Nepali guy of Tibetan origin in US.  He used to talk a lot about Nepalese caste. He used to make jokes on Nepali people, dress, and food. I never argued with him because i didn't want to waste my time. After few meetings, i tried to stay away from him. I found that we have lots of cultural differences but don't think they really hate Nepali people.