Millwall hooligans have participate in race riots and hate crimes. Beitar ultras chant death to Arabs and parade signs of far-right parties who want to clear their country of Arabs. Lazio ultras constantly do racist gestures towards black players that play at their stadium. Spurs and Ajax fans go away and endure antisemitic abuse. Kathryn Mayorga was the victim of harassment from sections of Real Madrid and Man United fans for accusing him. And yeah, some Arsenal fans did the same to Chaur after accused Thomas Partey on Twitter. Some of the supporters in the Leeds stands cheer on career-threatening injuries that happen to their opponents. Liverpool fans go away to hearing chants and jokes about Hillsborough. Some Newcastle fans took it upon themselves to celebrate the legacy of MBS after their purchase by the Saudis.

Notice how easy it is to cherrypick and generalise an entire group of people. You go far enough, you can accuse any fanbase of something. But, for some reason it's just Arsenal fans that have a particularly horrible fanbase? Get your head out of your fucking arse and touch some grass. What you read on Reddit isn't the entire world.