What a ridiculous thing to say. People have been able to look at another person forever and correctly say what sex they are and be right 99.9999999% of the time. The only times people were wrong were when they had a very specific DSD. Those people are the exception to the rule of being able to tell sex simply by looking.

You’re basically saying that what someone is biologically is irrelevant, what they look like is what determines their sex. That is so incredibly sexist that it’s hard to even believe anyone could believe it, yet here you are.