You haven’t read about it because the occasional — and they are occasional — overzealous acts of social-justice activists who cross the line from walking out on a commencement speaker (perfectly legal) to throwing rocks at the speaker’s car (not at all legal) feed the popular narrative that drives clicks to news sites and donors to free-expression organizations.
But the piece of First Amendment turf over which these battles are being fought is a small and peripheral one: Whether “hate speech” is constitutionally protected (undeniably yes) or should continue to be constitutionally protected (open to reasonable debate) against government regulation on a college campus.