3. I think that transgendered males are still defined as males under the law, and so would be subject to restroom policies- the same would apply for females.
What set of people do you mean by 'transgendered males'? My opinion of the language usage and of the current law is unformed until this is cleared up.
To Senator Clarence, dressing as such-and-such (gender expression or performativity for people who are hip to the lingo) can certainly be argued to be choices, but the feelings and perceptions that underlie this aren't, so it's a matter of how one is to deal with where what isn't a choice becomes what, arguably, is. It's similar to the distinction between homosexual inclinations and homosexual actions that for example the Roman Catholic Church makes.