Found this from last year by Josh Yohe at The AthleticI remember during his draft year reading that his junior teammates hated his guts - no idea how accurate that is but I suppose it's possible he has a bit of a 'tude.
The Penguins think Sprong has a bit of an attitude problem and a bit of a maturity problem, so they're making him pay his dues in Wilkes-Barre. It's nothing serious. He's not a bad kid. Just has a different personality.