[rmc]

Everyone can be a minority if they decide to, depending on how you cut the population.

Correct. But not all minorities have the same amount of power/wealth/prestigate/social stigma/advantages. "Minority" was originally a term to refer to some people. Don't take it too literally. It's not "minorities" per se that's bad, it's when one "minority" has much less power and advantages than the people who aren't in that minority.