Why is harassment only deleted when it's spam reported?

Really hard to get used to the rules (outside GD, on boards like gameplay) when shit only gets deleted if it's harassing popular people and spam reported by their followers.

But then the exact same comments come flying toward you in one of your threads and you report it and nothing happens because you're not popular and no one else reported it.

Example: I got called "boosted" in one of my gameplay threads. Nothing happened. I can guarantee if I called an Arbiter "boosted" it would be instantly deleted and I would be banned.