How many countries currently have laws making it illegal to be cishet, sometimes punishable by death.
In the US, how many states have passed laws making cishet relationships illegal. What year were they repealed?
How long did it take for an American president to openly support cishet marriage?
...but like other folks have talked about, it's difficult to use logic to get someone out of a position that they did not logic themselves into. You're arguing with feelings, and so long as he feels oppressed, that's going to be the truth of his world.
Honestly, the best bet is probably to cut him out of your life. If he values your friendship he'll try to make amends. If not, your life will likely improve without a toxic influence.
If you don't want to do this, because you value his friendship or want to teach him, that makes you a wonderful person and I wish you the best of luck. There's a lot of resources out there on healthy menslib places (such as reddit /r/menslib)
You and I and everyone here knows it's not caused by LGBT people. But commentators on the right have been pointing out all the problems that men face and point the finger directly at LGBT, Feminists, and POC. Just like how the Nazis did the Jews. Yeah it's not true that it's LGBT people's fault. But thanks to propaganda he now believes that's true. It's up to OP now to decide whether this friend is worth keeping and help deprogram him, or whether it's time to leave him and move on. And that's a deeply personal question that OP will need to decide. There isn't a right or wrong choice it's just whether it's worth the effort of deprogramming them or not.