Just my 2 cents, and echoing some of the sentiment in this thread.

IMO, if he's buying Telsa stock, it doesn't make your buddy a Nazi, or even a Nazi sympathizer. He's just a guy making money in a capitalist system. It is what it is, and I'm not going to blame anyone for trying to make money where they can. I have friends in the same situation, making money off Telsa, and also despising Elon as a person. I don't hold it against them, everyone needs to find a way to support themselves. You aren't going to sewer your own financials just to be morally superior, because that's going to be a net loss, and it's pissing into the wind in terms of fighting the system.

If he's overtly supporting Elon himself, that's a different story, but it sounds like he just is making bank off the stock, will ride it out as it's in his best interest, and there isn't much cause for concern.

Again, like other commenters have said, just talk to him. Make him aware you understand he likes Tesla, but ask him if he supports Elon politically/ethically. Make your decisions based off of that. A lot can be accomplished with just a casual conversation. I wouldn't recommend talking to him with an accusatory or defensive standpoint. I would be pretty casual about it to see where he sits.

Good luck friend. It's nasty out there.