If my 16 year old came to me and asked to have their hearing removed as a solution to their mispohonia and that their therapist agrees and they found a surgeon… I don’t think I could just jump on board with that call.
Comparing having your ears removed to transitioning is kind of concerning. This parallel makes it seem like you believe being trans is a disability.
Trans people also do not just one day go and have life-altering surgery. It is a long and arduous process with ups and downs, if you prevented your 16 year old from beginning that process the likelihood is that you will end up with a very resentful and distant adult child in the future.
This logic implies that you would be comfortable with an almost-fully transitioned trans male using the female toilets. They are 6'1", well built, bearded and indistinguishable from a cis male, but they still have a vagina and therefore since we are allocating toilets on genitalia, they must use the female toilets.
No it doesn't make you a Nazi to say what you just said, but I do think you are worrying about things that really are not an issue.
Stopping trans females from using female toilets does not prevent straight cis men from sneaking inside to do something nefarious -- you know, the demographic that is by far the most likely to sexaully assault someone?