I think you have some misunderstanding about how anti-discrimination laws actually work. Others probably have more expertise than me, but I would highlight the

I think you have some misunderstanding about how anti-discrimination laws actually work. Others probably have more expertise than me, but I would highlight the following points: 1) The only way such a lawsuit would be successful is if he actually did something to indicate some decision was based off of caste. 2) Everyone can already be sued based off of attributes they have inherited against their will. People can be sued for discriminating against the opposite (or even the same!) gender, people can be sued for discriminating on the basis of race. Your son didn't choose to get born Indian, but he could still be sued for promoting Indians over Hispanics or something. 3) It is not only higher caste Hindus that can be sued for caste discrimination if that's a protected status. A manager of no religion or any religion could also be theoretically sued for discriminating against low-caste Hindus--or descendants of Japanese butchers, which, to my knowledge, constitute a low caste in Japan.