You might be more specific. Something about the paradox of tolerance, maybe?
But anyway, you admit that your idea of free speech has restrictions, and their idea of free speech also has restrictions, but the difference is that yours are the necessary ones, by your values. Their restrictions are the necessary ones by their values, but their values are bad and wrong. I'm only being slightly po-faced here, I think this description of the situation is probably literally true, barring mistakes and room for improvement in the good value system and the outside possibility of adherents of the bad value system being occasionally onto something insightful.