Talking to him and being a good person can do more than you realize.
I was raised white Christian nationalist, although we didn't call it that and I wouldn't have realized that's what I was. I was taught all the conservative bullshit, both politically and socially. Thankfully there was always a part of me that was like "something isn't right here" and I kept my mouth shut and was never the bully going around mouthing off to gay kids or minorities, but I definitely thought things like "being gay is a choice" and "poor people should just work harder" and "abortion is something welfare queens do" but also "welfare queens have lots of babies for more money".
Being around people like you who were nonjudgmental and just talked about their point of view and occasionally gently challenged my beliefs without being confrontational opened my worldview and helped give me the courage to listen to the voice in my head that was saying something felt wrong with the belief system I was raised in. I'd always been taught things like liberals were stupid and lacked critical thinking skills and acted solely on emotions and I was young and kept in a bubble and was dumb enough to believe it until I started meeting people who proved otherwise. That was enough to start the cracks forming that eventually shattered the entire wall of lies. I'm now a raging socialist and I don't care how people live their lives as long as they aren't harming anyone else. I don't think I would have ended up that way if I wasn't someone who is willing to think for myself and who isn't afraid to be the "black sheep", because leaving that mindset lost me my family, but I definitely wouldn't have ever been able to start down the path I'm on if I was never exposed to people like you who started showing me the lies in the first place.
That's what fixed the rest of what was left of my toxic worldview. I started working in healthcare. I've treated people from all over the world. I've treated people who speak so many different languages. I've treated people of all religions. I've treated different gender identities and sexual preferences. I've treated people I knew were rapists or murderers (fucking worst, but you grit your teeth and treat them like human beings who need healthcare). I've treated so many refugees from various places (love the refugees, keep them in the US!)
All of them are just people. I've met a lot of really shitty people and a lot of really good people. It's hard to hate a group of people when you meet individuals from a particular subset and realize they have the same hopes and fears as you. At the end of the day, we all just want to go to our respective homes and be safe and loved and alive and there shouldn't be anything political about that.