The rest of what you're saying is gross, sure. But your outlook on this is primarily influenced by how you view them, and I'm not that sympathetic to your plight when that outlook is "they're a man who calls themselves a woman".
Assuming this really happened, that is a really inappropriate thing to say at work and I sympathize with the idea of hearing something deeply inappropriate and uncomfortable. But I haven't known trans-averse people on CE to be reasonable or necessarily acting in good faith in regards to topics about trans people, so I don't know if I should take you at face value. But that's just me.