I can see why some young drummer might be put off by Dave's joking around. But part of it might be coming from his rebellion against the mechanistic approaches to drumming that predominate drum education. I see instructional videos that are absolutely ridiculous, where the "instructor" ought to be arrested for impersonating a drummer. In reality, Dave is as nice a fellow as you could ever meet. I did a gig where he used my drums in the following act. Played his ass off. He was appreciative of my letting him play my kit. After the performance, he was helping to put away my drums. Who in the "Big Time" goes all out to show appreciation and help out? Not many.