Rainbow Crow, you acknowledge in your first post that gender is not a choice. I think that most transsexuals would agree with your assessment, since they believe that the gender that they were assigned at birth because of their sex is not correct. It's not that they are choosing to change genders, they are choosing to reconstruct their body so that it matches their gender. The nature of this decision is not choice, even though the procedure is elective. If anything the argument is environmental determinism. To me it is much the same as the homosexuality argument: whether or not you think it's biological and not psychological in nature does not affect the fact that it is not a choice, even though certain aspects of both lifestyles are "chosen". If someone is forced to have a sex change operation or forced to have anal sex, it doesn't make them become trans or gay, precisely because these are state of minds that emerge, not choices inorganically forced onto someone.
adults don't need to care what their parents or really anyone else thinks about their activities,
Oh sure, no one needs to care what any adult says to them until they want to do almost everything you could possibly do. This part you just put in so you could follow it up with your condemnation of the transsexual lifestyle. By the way, when you say that it's unnecessary for a man to do that I agree. If a man did that it would be distracting, vulgar, and inappropriate for school. However, if a woman does it, it's fine, correct? So really your problem with it seems to be that it was out in the open and public. There is nothing that you have said that would convince someone that getting a sex change operation is a bad idea, and you have not offered any counter to the argument that it seems to empirically improve the quality of lives of the people who receive gender reassignment therapy/surgery. The only argument you have is that you don't want to be a woman even though you knit (so no one else should try to become one for any reason for some reason?), that it makes people uncomfortable (which isn't much of an argument, just a statement of truth), and that gender is static and unchanging (LOL). Is there anything you could clarify that might strengthen your arguments?
My point is that you seem to be saying that "male" and "female" activities require dressing like a man or a woman and demanding that people refer to you as being of the opposite gender but that isn't the case.
My history teacher taught me that you can find truth in any writing if you look at the societal context. When you say that crocheting is a female activity, you're not making a true statement, but you are revealing a truth about our society: we think that knitting is for girls, not for men. We all acknowledge the division between male and female activities. You shouldn't be surprised when a person spends their whole life wanting to be someone else so that the activities that they want to perform every day are acceptable, that they actually pursue that goal to some extent. You also should not come back with "well they just shouldn't care what other people think and do what they want", because this goes against the very principle of what you're saying, which is that other people should care of what others think in this particular instance.