If you accept that drugs/trauma can cause altered states then can't you also accept that some people have the altered state as their default?

Modern politeness encourages us to think of all humans as more or less the same, which I think causes a default minimization of difference mindset.

One thing that really blew my mind in my 20's was learning that asians have a different type of earwax -> usually white and dry instead of yellow and waxy. It really shocked me that I was never taught that in school, and if people are unaware of common physical differences I am sure we are largely unaware of common mental difference.