It's not a caste in the direct sense. I mean rich people who adopted their cultural practices or married into (which would be hardly even possible in a 'true' c

It's not a caste in the direct sense. I mean rich people who adopted their cultural practices or married into (which would be hardly even possible in a 'true' caste system) were generally socially accepted. Of course being Irish/Catholic/Black etc. would've disqualified you but it's not quite the same thing.