No, I can't think of a single written phrase that is not a specific threat of violence, that when displayed on public property would justify punishment by government authority (which includes, in my view, public schools).
And according to the opinion written, the examples you gave scaeagles, would almost certainly have been protected by the court because they are purely political in nature. The quibble the majority got to hind behind is that the Bong Hits 4 Jesus sign was supposedly an encouragement to illegal activity.
So, interestingly, apparently a sign saying "Everybody do smack" is punishable but a sign saying "Legalize smack so everybody can do it" is
not.
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