Sorry, more than two genders, especially if you go beyond strictly physical criteria. Catch up on the science. You are right though. How transexuals are treated medically is none of your concern as long as you treat them as respectfully as everyone else. You have no cause not to because, again, this is a medical, not a moral question. Even the bathroom wars had been settled until the right wing brought it up to hide its failure to-stop gay marriage and abortion.