It's a very simple concept, described by Karl Popper in a single straightforward paragraph, commonly referred to as the Paradox of Tolerance. It's one of those lessons that came out of the aftermath of the Holocaust, which for some reason people go through great pains to refuse to comprehend.
That's fine - should you ever find yourself as part of a demographic that some other group wants eradicated, feel free to defend to the death their right to organize and recruit and argue for that, and tolerate their hatred as much as you like. In fact, just out of principle, make sure they have access to as many platforms as they want and can gather as much political power as possible. Maybe even try to engage them in debate, despite the unequal power dynamic between truth and lies (particularly in the modern ecosystem of engagement-driven social media and manufactured reality) - sunlight is the best disinfectant after all.
I'm sure it'll all work out OK.