So... if the forums are supposed to be a childish chatroom, just get rid of the forums and replace them with an actual live chat.
If the forums are supposed to be worth reading, maybe redirect people in forums that are being used this way to an actual live chat.
(Or more likely do nothing and have the worst of both worlds, but a guy can dream can't he?)
That kids have no idea how forums work. They think it's some anachronistic form of a live chat. A chat like you might see on Twitch, Discord, or etc.
See here:
https://www.chess.com/forum/view/off-topic/hi-56434928?page=1
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So it's not because they're dumb or trolls... but they just have no experience with... reading or writing something meaningful. If you took the time to do that in a live chat you'd miss 50 messages and no one would read what you wrote.
On a forum, you take the time to write something worth reading, because a day, or a week later someone might actually read it.
It might seem like I'm taking a cheap shot, or this is obvious, but I just now figured it out heh.