Well, I’ll do my best explaining this.
Antis are people who dislike any person who likes any weird shit in fiction (incest, pedophilia, rape etc.) and they think the non-antis support the weird shit in real life. But that’s not true! Also, they make very serious accusations of someone being a pedophile, rapist etc. but that’s frikin ridiculous. They act like “fandom moms”.
There’s also the likes who do suicide-baiting, death threats, weird body fetish phrases (like “pee your pants”, “suck your toes”). Those are the real freaks.