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Just to address the comments directly, I think the issue isn't that someone was mean online. The issue is that the platform is designed to keep impressionable minds engaged at any cost, including their mental health. It's effectively Las Vegas in their pocket, and we wouldn't let 14 year olds loose in Vegas. We have rules for that which we all agreed to pass as laws.
The discussion is at what level and what kind of rules we might need.
There has to be some way to work towards a society where that guy keeps his mouth shut instead of being a dick to a teenager that was just having fun.