Audio problem: When Walter is destroying the expensive sports car, the owner comes out of his house to stop him. You hear him screaming, but his mouth is not moving. (01:12:40)
Audio problem: When the Malibu Police Chief throws his coffee mug at The Dude you hear it glance off his forehead but never hear it hit the floor. Even if it somehow didn't break, it's a solid floor (not carpeted) so the impact would've made a noise.
Answer: Generally, he means that the boy, Larry Sellers, is disgracing his family (Walter has huge respect for the boy's dad, but considers the kid a dunce). Specifically, Walter is blaming Larry for his father struggling to breathe; that's Larry's dad in an iron lung in the background. Walter and The Dude become louder, more insistent and more vulgar, but the kid still blankly refuses to answer, and all you can hear is the iron lung pumping in the background. Frustrated because the kid isn't intimidated, Walter lashes out: "You're killing your father, Larry!"
Charles Austin Miller