That's the title of this great profile of Billy Boy on Slate. It's a look at how often bully boy Billy likes to tell his "guests" to shut up. Well worth reading.
Bill's most outrageous "shut up" moment, as mentioned in the Slate piece, was Feb. 2, 2003, and his on-air verbal berating of Jeremy Glick, who had lost his dad on 9/11. It must be seen to be believed. Here's a clip of it, from "Outfoxed":