There is no great difference between peoples. You can find someone from an Amazonian tribe that has been separated from the rest of humanity for thousands of years, and within a few years they are likely to be wearing clothes, going to church, speaking Spanish, Portuguese and/or English and spending most of their waking life poking at a smartphone screen, just like the rest of us.
Whether they should or not, or whether or not we should be happy with people running up and down the high street dressed only in war paint is just a matter of preference and not of any profound significance.
As long as people can be trusted to treat others with consideration, why should there be any conflicts?