The truth is, Tibetans never considered themselves as part of India. They had always wanted to leave as soon as possible to go back to an Independent Tibet. However, their government keep failing them by giving empty promises which will never come true. It is right for Indians to treat the Tibetans as a foreigner as in actual fact, they are foreigners.
The Tibetans came to India and India welcomed them with open arms. However, the Tibetans look down on Indians and do not want to assimilate into the Indian society. So it is only natural that the Indians will treat the Tibetans like a foreigner in return.