Interestingly you just regurgitated right wing propaganda without knowing it. Black and Central/East Asians, while certainly not common, casually roamed around Medieval Western Europe on pilgrimages or business and rarely ran into race issues.
It would not be ahistorical at all to run into some Korean pilgrims or African traders.
Medieval European peoples generally cared more about class and wealth than race. Rather ironically, it’s a modern fascist invention. Were you a Hawaiian prince or a peasant from Normandy? King or serf? Race had nothing to do with it for most people.
One of my favorite work chores was going to the big box hardware store in full work kit (hi viz vest, industrial radio, random pens and knives and shit, etc) and telling white people I don’t work there.
Yes, for some reason the minorities were either already working there or didn’t ask where their nail was while literally staring at a wall of nails.
Anyway it was incredible how some people, even the young ones, just cannot change their mind that I did not work there. The young ones were cool and laughed it off (while still assuming I worked there) and the old ones just went into this weird mental feedback loop.