I know transsexual people exist. I never said that they didn't or anything even close to denying that they do. There are many men who identify as women and many women who identify as men and they are men and women respectively because the words refer to reproductive structures rather than states of mind or quarternary sex characteristics in the brain. I'm not saying that how the language works is a good thing either; it's bad and it's sad but that's still the fact of what the words mean. Just because it's bad doesn't mean it isn't true. Global warming isn't good either but it's true and people have to deal with it.
Just as faith can not really move mountains, how you feel on the inside doesn't change the facts of language or biology It is impossible for things of the mind to directly override things of the world or of culture.
I daresay that in 20 years time it will be an accepted mainstream meaning, and if it becomes so then I shall have to accept it as such because my mind has no more power or relevance to the world than anybody else's, but it is not a correct mainstream usage now, so until that time I will continue to be bothered by it.