When other users pressed him on that, he admitted that he had never talked to a trans person in his life, which is probably better for all the trans people he could run into.

I don't know. Lack of exposure to different people and cultures is often a root cause of hatred and LGBTQ+ phobia. To be clear, I'm not advocating throwing trans people at transphobes with literal or figurative catapults in order to fight transphobia. Just that ignorance and narrow world experience tends to breed such attitudes, when they aren't adopted explicitly to try to control people.