That was a quick comparison with white supremacy

I'm not Godwinizing this. The analogy is apt. Not because Veganism is as bad as the White Supremacy movement, but because militant veganism is culturally near-identical with regards to levels of organization, cohesion, and belittling and exclusion of the opposing majority.

Vegans are not special. It’s like if I had the same nationality as someone, do you really need to call out someone from the US that shit on European (assuming you are from the US) ?

No, vegans aren't special. Thank you. And yes, I consider it my responsibility to call out the American anti-Mexican rhetoric that's been rekindled because if I don't, I am complicit. I am struggling not to tangent into at least 20 other incidents between old racial slurs and attacks insults about homosexuality where I've had to stand up against "my class", but the moment I hadn't done so, then I'm as bad as them.

this article that list a few vegans that are against militant

Unfortunately, this article supports my point in a way I don't know you intended. This is an article discussing how militant vegans (including the creators of Dominion) are against the tactic of insulting non-vegans directly in their goal of getting everyone to stop eating meat. Further, this clearly rebuts your earlier claim that militant veganism isn't "a community".

Remember, if you're activists against someone's behavior, you're attacking that behavior. You need to be damn sure the behavior you're attacking is objectively wrong. Good-cop Bad-copping it doesn't change that.

And I never wanted to say most vegans agree with extremists. Theses assholes are ruining veganism image

Then, do the world a favor, and call them out. It probably doesn't get veganism across the line of reasonableness (stopping pushing for others to be vegan is where that happens) but it gives you a bit more of an ethical foundation.

Without them people would hear vegan and think about nature, saving animals, saving the evironnement

I hate that most vegans I meet won't agree with me on animal protections in farms because my goals still involve people eating them (EDIT: them=animals. Stupid English language unclear pronouns). I consider my home state's new free range chicken law a massive win because it doesn't play with the meaning of "free range" like many big companies do, but most vegans consider it "just another step in normalizing humans eating animals". You've heard the statement "making perfect the enemy of good", right? Well, there's a step worse, which is making "my personal preference the enemy of perfect".

Let me make this clear. We exist in a world where we can scaleably give farm animals a better quality of life than they'd get in the wild with a better environmental impact than not eating them, but it requires regulations that vegans are often unwilling to openly support because it's not what they want.

But right now they only think about 30 years old Karen screaming at them for no reason calling people murderer and so on.

Agreed. Memes become that because they're often true. "How do you know someone is a vegan?" EVERYONE has experienced that particular little joke dozens of times if not more. I used to have a coworker who aggressively preached veganism at me, as he gained a ton of weight and his health degraded. This is not me saying that vegans can't be healthy, but he was definitely doing veganism a disservice.