Legendary insult comic Don Rickles, famous for mouthing off to generations of fellow celebrities, died Thursday of kidney failure. He was 90. Rickles spared no one — not fans, not presidents, not Hollywood royalty. He once told Frank Sinatra, “Hey, Frank, make yourself at home. Hit somebody.” Carl Reiner once said he knew he had made it in show business when Rickles insulted him. Rickles was idolized by generations of comedians. “A giant loss,” tweeted Billy Crystal. Along with a long career in stand-up comedy, Rickles appeared in numerous films, including Run Silent, Run Deep, The Rat Race, Kelly’s Heroes, and Martin Scorsese’s Casino. He also voiced Mr. Potato Head in the Toy Story films.