I guess it's just me, but I don't understand why everyone is so upset about what he did. There is nothing in the rule book that says a ref has to listen to a player critiquing him during the game. Hell, we don't even know what JB was saying. For all we know he could have said he was banging his wife.
It was unprofessional and disrespectful. There's an unwritten rule on pretty much any level that if a player wants clarification on a foul call in a dead ball situation, the ref obliges. And that's even more true for a 4 year guy that's been around long enough for every ACC ref to know him well. Unless Joel has been a shithead to Valentine in the past, there was absolutely no reason for him to do that other than to show him up. And that's a dick move.