When trans activists make the argument that we can't rule out all trans people because there's nothing they all have in common, that's the point where there's no point continuing the conversation, because it's such obvious bullshit that there's no way they're arguing in good faith. No trans man has a real penis. No trans woman has a real vagina. Yes we can tell the difference (well, I can't speak for vaginas, but I know a real penis when I meet one), and yes it matters. But obviously most trans people aren't going to admit 'yes, there's a tangible, meaningful difference that makes it completely reasonable not to date us even after we've spent tens of thousands of dollars irreversibly altering our bodies.'