Slim Shady has never been notorious for being a stand up character. In fact, he's almost exactly the opposite. Considering that guns being pulled in America isn't all that much of a rare occurrence, we can absolutely confirm this rumor to be true.
In 2000, Eminem was arrested for two separate gun-related incidents which happened within two hours of each other. But were they justified? The jury is still out on that one, although the targets for his pistol include the Insane Clown Posse road manager Douglas Dail and the bouncer he spotted out with his ex-partner later on in the evening. He was put on probation for both incidents, but did he learn his lesson? Probably not. The lovable rogue he is.