No matter how much you try, all it takes is one guy at the end of the corporate pep-talk to say something intentionally toxic and it will always get a huge laugh. You can't beat human nature. And you can't tell people to be nice, you have to show them.
I applaud any effort to curb this shit, but I think the reason everything is terrible online is because there's no real role models in gaming. You don't see gamers on TV or in Movies generally. There's no gamer hero archetype for people to vibe with. Most gaming celebrities are just streamers, and they can be super toxic, and their chat loves it.