Tell people to stay on topic?
The solution shouldn't be for me to have to closely monitor every thread so people don't have to think about what they're posting. But I've certainly done that; in fact, I have had entire communities of people angry at me and talking about how I'm such a bitch on various social media outlets for doing exactly that. I got angry PMs when I told the Animal Crossing thread to stop posting creepy sexual things relating to the characters in that game and alienating other members, too.
I mean, a lot of this comes along with being a moderator, but in some cases I just have to shout "really?" It's like some people forget that they're on a public forum where hundreds of thousands of people are reading their posts.
But how will banning the word stop that discussion from happening. Just start banning people that derail threads with that kind of talk.
I didn't call for banning it. I'm actually calling for people to use their brains and learn to read situations more than anything else. Saying "just ban people who do it" is naive. It takes lots of (volunteer) time to monitor and go through threads looking for that kind of thing, and it's silly when it could just not happen in the first place.