The messaging is very similar to people who are into more extreme forms of body modification for aesthetic reasons (tattooing, piercing, implants, etc). But I think there's a major difference between fans of body modification, and the transgender activists promoting transgenderism as having absolutely no drawbacks or potential criticisms.

People who get extreme body modifications done are generally adults; it's not something kids would be allowed to do at a professional piercing or tattoo studio. It's not something that's actively promoted to children, it's not something children are shamed into doing, and if you're not into someone with a load of facial piercings or tattoos you're not called a bigot or accused of committing "literal violence" if you aren't attracted to them. You also don't see people claiming they've literally change sex or species just because they've gotten body work done, and demanding other people refer to them as such.

Transgenderism on the other hand encourages ignoring underlying mental health issues, and using massive does of hormones and frankly bad cosmetic surgery of the genitals as a way of dealing with those underlying mental health issues. All while demanding we declare how stunning and brave it is for heterosexual males to shame lesbians into sleeping with them. And demanding we act directly as fetish material for their autogynephilia by being forced to declare we view them as definitely real and authentic women or men, and not men and women who've just had some surgeries done but were still fundamentally born a particular sex.