what's the deal with mothers being so disturbed by top surgery?

since I came out as trans the thing that most disturbed my mother was the posibility of me going for top surgery. 7 years since I told her i was beginning to use masculine pronouns and she still uses the "processing" card. in all this time we had a few fights (we have a complicated relationship, besides my identity) and one of them was because i told her i began T gel and she told me she hoped i wasn't gonna cut my breasts out. i find it really disturbing that she cares so much about my tits, I'm 29 years old and recently i told her that finally i dicided to go for the top surgery and she didn't answer my message until the next day. i actually feel grossed out and feel like stop talking to her again, a friend told me that maybe i need to face this complexity instead of scaping like I always do when she makes me angry with her selfishness, maybe i should ask myself if it is worth it. i'm so sick of people in love with "the rules of society" so much they are willing to be pieces of sh1t with the people they are supossed to be caring with.

sorry to be so visceral i'm just so angry