I think you are being OTT about this. I'm neither for nor against them. Generally I hope they get on with their lives and be happy but sometimes they get things wrong. I think the thing I've felt most dislike about was what Harry said about the housemistress at his boarding school. I thought it was rude and unnecessary. On the other hand I've said on here I can't see the issue with the surname, Mountbatten-Windsor was a relatively recent (i.e. in my lifetime) made up name from two made up names so what's the problem.
I used to work with a disabled woman, one day a senior member of staff was seen showing some visitors some of this woman's equipment and laughing about it. The staff who had seen her were all upset and I can see Meghan laughing at Harry in that situation as very similar, it is not very diplomatic. I do think it is different to laughing when you are doing something which may be exhilerating and fun to do.
Generally I think the people who can see no wrong are as extreme as the people who see no right.