I think he's trying to say you shouldn't chastise people for exercising right of free speech.
No one wants to her the bullshit spewing out of a liberals mouth, because its ignorant and offensive. Yet these sane minds don't shout down liberals for saying the stupid things they say, they respect their right to free speech. On the other hand, liberals use their "free speech" rights to demonize and discredit anyone who disagrees with them, an abuse of the right to free speech.
Basically, if you're using your "free speech" to quell another person's free speech and your excuse for doing so is free speech, you are a hypocrite. It really isn't that hard.