Being transgender is more than just chromosomes. It means someone has a different sexual history than you're not used to. It means that someone's genetalia is different than their presenting gender, or else was artificially created. It means that someone had years of crucial physical development during which they development features of a gender that they don't currently present as. It means their sexual organs function differently or don't function. It affects their ability to have biological children. It's not nothing. It's biology. There's no point in arguing when we both clearly have strong opinions so I just think we should let it go and agree to disagree on this.