Calling a legitimate argument a "dog whistle" is a classic tactic OP is talking about which is used to shut down discussion. Just debate the merit of what he's saying rather than try to label him as an enemy.
Breast reduction for children IS in fact irreversible. It causes huge scars and trying to get breast augmentation later is not actually restoring their body to its natural state. It is definitely something that is controversial. Also putting children on hormones is within scope of this conversation and DOES happen.
There are lots of people who detransition and regret their decision. Children who have been sterilized for life and have permanent scars. It's completely valid to have discussions about whether kids should be able to make these decisions (they shouldn't).
Breast reduction for children IS in fact irreversible. It causes huge scars and trying to get breast augmentation later is not actually restoring their body to its natural state. It is definitely something that is controversial. Also putting children on hormones is within scope of this conversation and DOES happen.
There are lots of people who detransition and regret their decision. Children who have been sterilized for life and have permanent scars. It's completely valid to have discussions about whether kids should be able to make these decisions (they shouldn't).