There was only one case brought by Equality Labs, the Cisco case, which was thrown out. Any perceived discrimination also will be made out to be caste discrimination as there is money to be made, benefits to be had.
Upper caste manager dings lower caste employee for performance --> caste discrimination
Upper caste employee talks back to lower caste manager ---> caste discrimination
I think the point is that the people in US companies who are caste sensitive -- often after growing up in an Indian household-- are using their positions of power to hurt some castes. Remember that many of the big (and small) tech companies in the US are run by the Desi.