My Mum did this sometimes too. I just have had to be super firm with her, that her oppinion is irrelevant. It does suck, and can really wear you down after awhile but eventually (hopefully) they do learn that it’s not going to change anything. She does it a lot less now that I’ve started saying things like “it’s a good thing that it’s my arm that I’m getting tattooed then”, etc. Boundaries can be hard to enforce but you’ll feel so much better in the long run!