Randall Munroe speaks truth about speech. Make sure to hover the cursor over the image for illuminating alt-text. (Tablet users, I think you’re out of luck. I’ve never figured out how to do a “cursor hover” on a touch-screen.)
Key takeaway: If you say stupid shit, your 1A rights are not violated if someone calls you on it. If you act like a boor, your 1A rights are not violated if you’re booted. Your right to free speech does not guarantee you an audience.