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I've seen it too. Tech workers are mostly brahmans. Some lower classes snuck in because the government has affirmative action in India. Oh boy, it's rough. I've also seen them mistreat indian taxi drivers, etc. They know the caste,.for me.thwy all look the same. But yes it's a thing
Reposted with full and correct title >

Wait, we have a caste system here? >

No, but if immigrants continue to discriminate against other immigrants based on the old country's caste system, that not technically against the law yet. >

That makes a lot more sense! >

In what way would someone of a lower caste be discriminated against here? >

Same way other minorities are.
I've seen Indian caste discrimination first hand, and it's just as ugly as any klansman. It was shocking. 
Glad this is getting attention.