It's weird to not want young, vulnerable girls seeing fully grown men use their private space where they go to the toilet? What's weird, dangerous even, is you thinking that's in any way, shape or form acceptable. Young children are not developed enough to understand why they are being forced to share intimate spaces with men.
Those are two points (bathrooms/sports) I will never concede on the issue. Everything else when it comes to people deciding their genders, they can do what they want as long as it doesn't impact on freedom of speech and the two aforementioned issues.
You've got your perspective, I've got mine, and a majority of voting Americans would side with me. I respect you have an altering opinion - people are allowed to disagree.