VioletSky and I usually disagree on most things. However, I have to say, I 100% agree with her post at 23.35.
MM will certainly have experienced some colour racism and also some anti-American snobbery in the RF. Much of it will have been very discreet but it will have been there. God forbid I should mention that awful woman, Princess Michael of Kent, but she is the most obvious manifestation of those sorts of attitudes.
However, I don't think the Queen will have been one of the people indulging in that nastiness. I am a republican but I think the Queen has always taken her role exceptionally seriously. In addition, I think she values the commonwealth so much, so doesn't have those entrenched bigotries. Phillip did and will have passed some of that to his children. Not to mention, the court circles, including the staff. Racism isn't just an individual thing, it is institutional and a seam of it runs through most British institutions.
Isn't Charles the one that is reputed to have wondered about the colour of Archie before he was born? QE should have had an exceptionally strong word with him. She is, after all, the boss.