> This isn't even remotely difficult

Not technically but in practice it is difficult.

- What happens if I opt out but you reply with an "offensive" word in the thread I'm in?

- If two people are discussing and one uses "offensive" words what do I see? Nothing or one person screaming at the void?

The other problem I see having more confirmation bias. We would have a split in the community between politically correct and incorrect. You'll get deeper in the rabbit hole if you only talk to people that have the same views as you. Regardless of which side of the wall you're at.

Edit: Formatting

If someone wants to hammer in screws, let them. YouTube is a tool. Obviously things will be a bit broken, that's what happens when you want a hammer for screws.