JanaJaatis, are ethnic groups who are native to a land or region, especially before the arrival and intrusion of a foreign and possibly dominating culture. They are a group of people whose members share a cultural identity that has been shaped by their geographical region. A variety of names are used in various countries to identify such groups of people, but they generally are regarded as the "original inhabitants" of a territory or region. Their right to self-determination may be materially affected by the later-arriving ethnic groups.               -wiki

The main factor of discrimination toward the marginalized groups, including the JanaJaatis, was Ba-h-u-nbad. Ba-h-u-nbad was defined as domination of hill 'upper-caste' Hindu males in the state apparatus and society, including the supposedly progressive realms such as media, academia and human rights groups, and formulation, implementation and legitimization of public policies and social attitudes that favor the dominant group through such domination in most of the influential realms of the society. Extensive domination had been made possible by adopting the hill Hindu religious ideology by the state, and communalization of the society by Hindu norms and values.

Now the things have changed, some remnants are still there and their comments are still defamatory and racist as you can see at the comments above.