Toni quit Bayern last January after being frozen out of the first team squad by Van Gaal.
"I had never experienced someone like him before. I remember how he once tried to make it clear that he wasn't afraid to withdraw the so-called big names. He just dropped his pants to show us that he had the balls to do so. Fortunately, I didn't sit front row so I didn't see anything," Toni told BILD.
"He's a crazy coach who doesn't know how to treat his players. Guys like him and Felix Magath are coaches from another generation and can't deal with the way players behave these days. Modern players want to communicate with their coach, but that's not possible with Van Gaal. Everything goes the way he wants it to go.
"He always wanted the players to remains seated until everyone had finished breakfast. However, Italians only drink coffee for breakfast so I finished early and made myself comfortable. The coach then showed up behind me and started screaming and pulled me up. He told me that he was in charge and that I should leave if I didn't like it."