Fancy words? Interesting comment for its lack of substance. What does stand out is your use of the word mob.
In Sociology it is defined as:
A group of persons stimulating one another to excitement and losing ordinary rational control over their activity.
Yet, your use of the word leaves out the antagonist, whose actions bring said "mob" together, and without whom there would be no event upon which to comment.
Though no law seems to prevent his speech or action, we do have a supreme court decision to consider, if one has an open mind and will set aside their bias for the interloper:
"Morse v. Frederick,
551 U.S. 393 (2007), was a
United States Supreme Courtcase in which the Court held, 5–4, that the
First Amendment does not prevent educators from suppressing, at a school-supervised event, student speech that is reasonably viewed as promoting illegal drug use."
Of course drug use is not the issue here, but a disruption at a public school seemed necessary and sufficient for an educator to act and infringe the First Amendment Right of Expression in both instances.