If it's simply a 1A issue, then he shouldn't have been banned. But this, from the article you cite, suggests it wasn't limited to disagreement with the teacher's point of view:
“More recently, as reported in some national and regional news, a student was temporarily removed from a class for behavior that the faculty member (and at least some classmates) viewed as disruptive to the learning environment,” he continued, adding, “the student chose to take his version of events to the media.”
So what, exactly, did he do? Was he genuinely disruptive? If so, that changes the context.
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