Understand that most of the general population operates on the level of "Somebody said something on the Internet that offends me; how could this have happened?" And that the maximum amount of effort they're willing to put in to rectify this situation is clicking a button. The realistic amount is that they wish it never happened in the first place. That's the level of user-friendliness needed to run a mass-market consumer service.
That being said I don't think it's impossible to have such a system in a decentralized way, there are incentive structures you could build to handle this.
Moderation is a fundamental requirement of any social system, and it's one of the two things that Web3 can't yet address meaningfully -- the other being addressability.