Quite ironic you are using India's caste system as an example of how primitive and un-just the society and how great Britain is when Britain is the very reason the caste system exists as it does today. Prior to British rule, castes were not widely understood along the Indian subcontinent and was one of many social demographic markers for Indians until Britain made it THE defining characteristic.

From the BBC:

"In fact, it is doubtful that caste had much significance or virulence in society before the British made it India's defining social feature."

https://www.bbc.com/news/world-asia-india-48619734