I've hung out with Billy (backstage after a show) and can attest- he's a really nice guy who truly appreciates his fans and loves to 'talk shop' about basses, amps, technique, etc.
One thing I think a lot of people don't realize about Bill is that when he's not playing blazing 32nd notes or doing two-handed tapped harmonics or insane neck bends, he's actually really great at laying down a simple eighth note groove. As a matter of fact, that's what he does most on record.
You should have asked him "what's a chromatic scale" lol!!!