Of course you're not going to say it, because you know how absurd, reductive, sexist and plain untrue it is. But it's where your mind went and I'd bet anything that it's the truth, which is why you're so antsy, defensive, avoidant and, yes, angry that you're being pushed on it. You still won't tell us what you do mean...
There are very, very few men who really do pass so wonderfully as women in real life that it never would have occurred to you they might be male. So for you to have encountered several of them in close proximity is so unlikely that I highly suspect that you're either really, really unusually bad at sexing other humans, like bottom of the bell curve bad (would explain how you know someone presents as a woman without knowing what that means, I guess), or, more likely, you're not being wholly honest about how well they pass, or why you think they "present as women".
I think we all know that "female name, long hair, makeup etc" is exactly what you mean, and we also all know why you can't say it. Has it occurred to you that you could avoid this brain melting doublethink and resolve the contradiction that gets you so antsy, just by accepting that they are men, they can dress and present as they like, and they may well be lovely people, but they are still men and sometimes that matters?