I have never personally experienced it and never really learned anything about castes the way others seem to treat them (ie I couldn't tell a person's caste from their last name). I have noticed that some people's first question after hearing a name is to confirm which caste that would refer to, but I've never really seen it as all too meaningful beyond an odd curiosity.

As such I don't really feel particularly threatened by being asked where I'm from. I do have a bias towards groups with more diverse teams (ie not just Indians) but that's more about enjoying the cultural exchange that comes with that instead of the homogeneity and conflict that can come from staying within one's own cultural influence.

If anything I've seen much more nepotism than casteism.