To quote something I said to a transphobe asking about where they can safely question "transgenderism"

And before you go off with, "So much for being tolerant of my beliefs!".

Tolerance is about preventing harm being committed onto others. Tolerance can not condone intolerance being committed against others. Intolerance always leads to harm being committed against others. Tolerance, by definition, cannot be tolerant of intolerance without becoming intolerant itself.

For example:

Me allowing you to openly critize my friends in the trans community without stepping in and telling you, "You're a bigot and your behavior is not welcome here." will lead to your behavior harming them by implicit acceptance of your behavior.

So, with kindest regards.

#You're a bigot and your behavior is not welcome here.