Do you think casteism is an essential property of India that should not be changed, throwaway_1928?
Does the US condemn the mass murder of and continent-sized land theft from Native Americans and the mass kidnapping and centuries-long enslavement of Africans by granting them 60% of all jobs at every level of government?
As you say, India has acted more resolutely against casteism than the US has against racism in some ways. So it should be incredibly easy for someone coming from that background to condemn casteism. If they didn't, it would be anti-India.
Americans do not fight racism as hard as they should, but almost all of them find it extremely easy to condemn racism. Not sure why it should be different for a US Brahmin and casteism.