The Indian immigrants you're exposed to via these channels are petty bourgeois or PMC climbers and often casteist. Or their children. If you look at everyone in these same positions who aren't Indian immigrants or their children, you will find a very similar story.

One part of this is that in the US, to immigrate from India it is more common to do so via education, either by already being educated or by going to the US for education and then staying. This will already reflect class and caste biases, the ability to have sufficient base education and any supplementary funding to maintain your education abroad.