In all fairness I would argue Medieval Europe was a lot less racist than Europe during Queen Charlottes time due to the whole superiority complex from conquering half the world not being in play and the whole concept of race based on skin colour would make absolutely no sense in that time period. Something that makes this claim even dumber.
True. Medieval European weren't generally racist but religiously they were pretty bigoted. But as long as you was Christian (usally Catholic or Orthodox depending where you was living) yours ethnic/racial background didn't matter very much if any. Racism became more common in 19th century.
If you really want to know a person’s ancestry, it makes more sense to think in terms of ethnicity rather than “race”. “Black” or “White” are meaningless, that doesn’t tell me anything, it barely even helps with visualizing appearance since that encompasses a veritable hardware store paint sample section of skin tones. If someone says “that guy’s black” it’s like what do you mean, that could be like two thousand different distinct peoples everywhere from New Guinea to Abkhazia to Liberia to Argentina, but if you’re specific and say “that guy’s Igbo” then we’re getting somewhere, that actually means something.
And even if you go with ethnicity it too would become meaningless and pointless. Someone could very well is one certain former prime minister Turkish because one of his great-grandfathers was Ottoman official.