As for race being a fairly recent concept, that’s true but fairly irrelevant when these universalists point it out. Of course the ancients wouldn’t have had the same understanding as we do today. The contacts for the most part simply weren’t there. Were our ancient ancestors universalists? No. Not only in the realms of culture and religion, but also amongst those whom we would consider being of the same race and even up to our own time, you can find peoples whose self-given ethnonym translates as man/person/real people etc. i.e they are real people, whilst their neighbors are of different origins. This push to pretend that we are all the same in bizarre, and one that I blame on globalization.