Pretty much this. 4chan has always been comprised of the socially maladjusted and "weirdos", but if you couldn't even get along here without picking a fight with everybody, you were rightly told to fuck off, often with the viable threat of mods joining in.
Now these /r9k/ rabid losers are so loud they think anybody who isn't immediately left or right of their abomination of an existence is a "normie" or "normal".
Why is this board dead? Sure, the show quality plays in part, but it's also the pieces of shits like him who destroy communities with their Nonstop unwarranted venom for no reason. Unironically they're the newfags for believing and spreading the idea that 4chan was always as hostile as it is today.