Gender and sex are not the same thing. Gender is an emotion experience, sex is a biological categorization based on an individual’s role in reproduction. Gender and sex needn’t match. Gender can change (mine often does), sex cannot. Just like sex people do not have control over their gender, if someone’s gender changes or doesn’t match their sex it is not because of a decision they made, it is merely an emotion. So be nice to trans people, they’re just people trying to not be uncomfortable living in their own skin.