Close friend transphobic

Tw:transphobia

I'm stealth with most of my friends, even my close friend group. For the longest time only one of them knew, but I recently came out to another friend and it went really well. One of my greatest insecurities is the idea that once someone knows I'm trans all they'll ever see me is as a girl, but I was feeling pretty validated now that I have two close friends that support me. Today, another guy in my close friend group went on a rant about how delusional trans people are, and took a strong stance on why medically transitioning is morally wrong in all circumstances. He said that even if he learned his best friend is trans he would still think they're delusional and extremely mentally ill. He also described medical transition as mutilation multiple times, and said that they're just attention-seekers. It just hurts a lot to see someone so close to me essentially confirm one of my greatest fears/insecurities. It's very hard to cope with.