See, I clocked this because every nasty thing they say about her falls into several sterotypical categories for Black women: That we are poor and cheap (the Temu insult), that we are hypersexual (she is a pedophile), and the angry Black woman trope. No matter what she does or says Meghan is always angry, or has an attitude, or looks negative in some way! In fact, the angry Black woman trope was one of the first tropes trotted out about her in the British press.
They hate Harry because he removed his family from the UK and the bullying his wife was subjected to in order to protect her, and they are angry becasue they no longer have the easy access to her that they had when she lived there. Its a lot harder to make your bullying stick (to make someone suffer) when the victim simply removes herself from the game.
They need her to be available for them to hate on and she refuses to play. Its impossible to show dominance over a victim who doesn't exist or isn't there. In order for there to be a bully there needs to be a victim and she refused to play her role and suffer as such people believe she needs to suffer because suffering is the purpose of Black women.