It's not the royals who have been causing the problem. The Queen has an official duty to approve or deny the marriages down to the 7th in line, and she has given her blessing, as have Harry's father and brother. It's things like comments in the DailyMail by anonymous posts, and presumably hate mail, most likely from within Britain, where the white native-born people have been sidelined and demeaned in favor of other racial groups, especially if they are undocumented immigrants.
OK, I understand now. Most of what I have read has come from the media.