If you don’t have dysphoria then you are mutilating yourself for pretty much no reason.
I understand that making feels based arguments are really important to you, so you like to use highly emotional and charged language. If a woman does not have dysphoria and decides to get breast enlargements then she is mutilating herself for no reason.
First that is a really smooth brained take, and second it is factually wrong. You don't like the reason but there is a reason. The reason for the body modification is because they want to have the body modification. No other reason is necessary or required, just as I am need no other reason to have orange chicken as my favorite food, or to wear the kinds of cloths that I do. Or to get my ears pierced or not. Or to do anything else. A vagninoplasty is not is by no means "mutilation". Even if it was however I wouldn't care because people can do with their body as they want.
@DirtbagLeft if you are non Dyphoric Trans, what legitimizes you as a man or a woman opposite from what you were born as that does not also legitimize this man as being a lizard instead of a human.
I am actually glad that you asked (serious not sarcastic). A huge part of the problem is that we are dealing with three distinct term that often times get conflated.
Term 1: Is a bimodal distribution between modes A and C determined by four factors. Gonads, Genitals, Hormones, Chromosomes. Within this distribution there are three broad categories A B and C. A and C are the two extremes with B referring to those who fall in the center. This is the biological definition of the term Sex (biological sex).
Term 2: the sum of the structural, functional, and sometimes behavioral characteristics of organisms that distinguish males and females. This is the medical not biological definition of Sex. Medicine is a sub school of biology but it uses a much different definition. This is in part because medical professionals are hack biologists. They learn just enough biology to make them able to treat ailments of the body in a time sensitive but effective way. This is not to degenerate medical professionals but to point out their knowledge and the very different job they have. (medical sex)
Term 3: the behavioral, cultural, or psychological traits
typically associated with one sex. This term belongs to the field of sociology and identifies primarily behavioral patterns and modes of thinking within a given larger culture. Gender is considered a sub-culture. Sociology analyzes institutions where as it is the function of psychology to analyze the individual. Macro vs Micro. Gender itself is a cultural construct and the numbers of genders as well as the genders themselves varies widely throughout time and place.
To be transgender one only need to identify as a gender other than that assigned at birth. Male and Female are terms which belong to Biology/Medicine and what makes one Male/Female depends on if you are talking about biology or medicine. Man/Woman, Masculine/Feminine (I am restricting the conversation to a binary distinction that doesn't exist) is purely cultural. In the Christian west we have reduced gender to two for theological reasons. We also tend to ignore that other genders exist in other cultures imposing our own classification system on societies where our classification system doesn't work.
All of that was to say that biology and medicine have nothing to do with gender or with the classification of man/woman. With the background information out of the way I can now answer your question.
"if you are non Dyphoric Trans, what legitimizes you as a man or a woman opposite from what you were born as that does not also legitimize this man as being a lizard instead of a human?" The thing that identifies you as trans period is identifying as a gender other than the gender you were assigned at birth. Identifying as a different species is in no way comparable to identifying as a different gender. Species is determined biologically. Gender is determined sociologically. To give a more appropriate example I identify culturally as Punk. Yet you wouldn't be able to tell just from looking at me because I do not superficially meet the standard of what most people think of when they think punk.
This is exactly why a man who has been castrated accidentally at a work site does not suddenly stop being a man because he no longer has a penis and testicles. It is also why a transman does not suddenly become a man because they had a penoplasty. On a personal level questions of
personal identity are psychological.
But lets take a deeper look at the implications of peepee = man, boobie = woman. The logical conclusion (as any of us that have grown up masculine and went through middle school through high school can attest) is the irrational thinking that bigger peepee = more man. and as I as women can attest to bigger boobie = more woman. This is a hold over from before we learn better of poor cognitive reasoning we develop as children (see children cup test).