I totally agree with you.
But just as a point of nuance, most people seem to object and find it off putting (to put it mildly) when CIS people get plastic surgery too. Breast augmentation and penile augmentation are seen by many (unfairly) as vain and ugly.
My point being, this probably isnt the best example, I do agree with you that people should be free (and not ridiculed) for any type of plastic surgery. But it seems to me whether we are talking about CIS or Trans plastic surgery they receive a lot of hate either way.