I think this is a controversial reality that often gets silenced. Even between different cultures and castes from the Indian subcontinent there appear to be clear and discriminate striations[1] that few people in my experience talk about. I think it's a serious issue with the millenial and younger generations of non-Indian American citizens.

Once I worked with a group that was run by a brahmin hindi speaker and a group of Tamils was under her. It was really weird to see them speak English to each other since neither spoke each others' native tongue. She was not very nice to the Tamils and spent most of her time planning for ostentatious Diwali celebrations in the office.

The US has no place for this kind of discrimination. We strive to be (I hope) a meritocracy.

1: https://www.brightworkresearch.com/enterprisesoftwarepolicy/...