Yes to what @ParrotheadRedux said. It's also behind some of the kneejerk negativity towards commoners marrying into the British royal family -- and we should remember how negative initial responses to 'Waity Katie' (and her 'Doors to Manual' mother) were, that it wasn't just Meghan Markle, and that it was not just racism in her case.
If you have been acculturated to believe the royals are the acme of the aristocracy (something not everyone would agree with, but 'the RF as arrivistes' is another discussion), who, despite their privilege, 'don't see class', are graceful, humble, unassuming, and charming to the lower orders etc etc -- then a commoner, especially from a nouveau riche background, marrying in upends hierarchies.
Suddenly people who believe in the 'materialistic, grabby and graceless' stereotype of the social climber have to countenance someone like that morphing into the 'timeless unassuming graciousness' of the RF, and it takes the shine off the royal mythos.
Hence the outpourings of spiteful delight when Meghan Markle was perceived as 'getting something wrong' in public after her marriage, by not facing forward in uninterrupted silence for the national anthem, or not wearing tights, or whatever. For a certain type of royalist, it was the equivalent of passing the port the wrong way, or saying 'Pardon?' Her origins were showing.