Something being technically legal doesn't necessarily make it moral or OK and whilst I absolutely agree that laws and regulations should be in place to prevent horrible behaviour, it's not reasonable to expect this in every case.
I'll absolutely make a decision to withdraw my custom if I don't agree that a company is acting appropriately, it's the only power you have as a consumer and the only thing companies care about is getting your money.
You can say I'm acting in bad faith, that's your opinion that you are entitled to, I'm telling you I'm not.
The reality of the situation is that you simply disagree with my opinion but you've chosen to attack me rather than the substance of what I'm saying. It's called an ad hominem.
You've applied the label of fascist and Nazi yourself, nowhere in OPs post does he define his brother as a fascist or Nazi. Left Vs Right political differences doesn't mean you automatically get to apply labels like commie or Nazi, a lot of people on Lemmy need to grow up.
OP bought up the Musk debate with his brother knowing that his brother is a right winger, then OP got upset when his brother acted just as you'd expect. He poked a dog with a stick and then got upset when it barked.
Honestly, and I already know I'm massively against the consensus here, but you should be the bigger man.
Tell your brother that you disagree with him but that he's family, you'll always love him and that you're honoured to be a guest at his wedding.
If you want to draw a line and say "let's not talk about politics though" or something like that, then absolutely do.
Don't have all your family and his friends talk about how you're refusing to attend because you had a fall out over politics, you're not going to appear principled, you're going to appear petty. You've made your point to your brother, now move on.
A large proportion of Americans are very ready to be extremely upset and will look in to things that aren't there, like a socially inept Musk appearing to make a Nazi salute.
Or
Musk intentionally made a Nazi salute.
I know it's emotional times, but I think a huge amount of people aren't thinking rationally.
The first day you lift is the day you realise that you'll never be able to lift enough!