1. No one is getting completely naked in a changing room. If she's changing, only you should be in there with her, no one else. That goes for all sexes/genders.
2. If they're in the stalls, who cares if they're masturbating? Do what you need to do, wash your hands and leave.
3. How are they going to intimidate and cow women?
4. They're no more attention seekers than anyone else.
5. You realize you're doing the same thing, correct? You people are the ones clutching pearls over restrooms.
6. They're not winning all competitions and frankly I think the "biological advantage" is overstated. You're not destined to loose a competition just because your opponent is a man. That's not feminist, that's just the patriarchy.
7. Rapists should be prosecuted regardless of their sex and gender identity. There should be more protection for prisoners so they're not at risk for being raped, period.
8. Everyone likes being praised. That's not a crime or bad thing.
9. You just implied that they would be able to win every competition It sounds like you already believe that shit.
10. They can be fired or be denied housing. They can't access healthcare without everyone going "are you sure?" for every little thing. Hell, in Britain a father wants to de-transition his 21 year old child!