Ever had the satisfaction of solving a problem eroded by children boasting about how easy it was to AC in -0.00s ? Why not turn the joke on them? How about word filters to convert such comments into something more useful for the rest of us:
“Easy one” -> “My underpants are even yellower now”
“AC in 1 Go!!!1” -> “AC in over 9000 go’s”
“Move to tutorial” -> “Didn’t even have to ask mom for help this time”
… etc. The filter should kick in after a while, so it won’t be immediately edited out. There’s also room for themes, like around christmas or other occasions, or specific filters for certain categories/problems.