In the US, you often see claims of "reverse racism", e.g. around affirmative action or just from general vibes. This is the equivalent - high caste people interpreting attempts at leveling the playing field as if they are being discriminated against.
Let's be clear though, in India these come on the form of explicit quotas. In some states, even if high caste applicants to university got 100% of the non-quota slots, they'd still be underrepresented because so many slots are reserved for caste. It's like if tech companies noticed their share of Asian tech workers was well above the 6% national average, and set a cap of only 4% Asians.