Consider reading [1] (also linked in OP) for a detailed article about a very talented lower caste person who gets hired at IIT Kanpur, only to be met with overt caste-based discrimination and harassment. You'd find it hard to claim caste-based discrimination doesn't exist after reading it. On a perhaps unrelated note, the author is Manindra Agarwal, who you may know as the A in the AKS primality test.
[1]: https://kafila.online/2019/04/10/the-saderla-story-courage-i...