I must be daft because I saw the curtseying thing completely differently. I didn't see it as Meghan mocking the idea of curtseying, although she was obviously flummoxed at the concept of it being done in private but rather mocking her own inelegant way of curtseying the first time she did it. It was more of a 'I'm trying to do what is expected of me here but I'm not sure I'm doing a good job of it' sort of thing. It was all very self-deprecating from the entire context of the episode which I actually watched.
But the moment I saw it, I literally turned and told my husband that the haters and the DM would be apoplectic and positively seething about how Meghan 'disrespected the Queen'. I guess I was right about 1 thing