[chefkd]

A lot of the world had hospitality rules and treated outsiders kindly. Lots of people were allowed to come and go as they pleased they actually provide interesting reads. Borders as we understand them today were invented in the 18/1900s. Mass slavery spanning multiple continents and racism on that magnitude hasn't happened since and hopefully won't happen again (except maybe Rome & Egypt but that wasn't trans continental)

[jajko]

One doesn't exclude the other. You / anybody could be most welcoming to visitors and have your slaves serve them the best you had and treat them very well. Norms change, sometimes shockingly, and even within one's lifespan. Now young generations will most probably realize this when they will become out of touch and rejected by new young generation in maybe 2 decades.