[ A ban on shunning is not enforceable in the way a ban on physical violence is.
But the behavior of urging others to shun is a behavior that can, and should, be banned. Kids don't usually have the wherewithall to remember that they aren't supposed to be talking to the target kid, so they forget after a day or two, and then they get threatened with being socially isolated or just strongly reminded that it isn't ok to talk to the kid who is being targeted.
But, because they had stars, all the Star-Belly Sneetches
Would brag, “We’re the best kind of Sneetch on the beaches.”
With their snoots in the air, they would sniff and they’d snort
“We’ll have nothing to do with the Plain-Belly sort!”
And, whenever they met some, when they were out walking,
They’d hike right on past them without even talking.
