Pitched ball that bounces

[Pete in AZ]

I know that this has been covered here before but I couldn't find it.

Sitch-Batter up in 18+ league here and we go by OBR except for slaughter & safe slide rules. Runner on 2nd off with the pitch and the lefty tosses a breaking ball that bounces two feet in front of the plate. The batter's trying to protect his runner and he gives a lazy swing and hits the ball over the 2nd baseman's head. He legs it out and is standing at first with the whole place laughing. The head coach from the other team comes out and tells me that he can't hit a pitch that bounces and he should be out for interfering with his catcher's ability to throw the runner out. I tried not to laugh and said that the AB counts and the runners stay at first and third. He goes back in the dugout and grabs the rule book. His team goes on to win and after the game he walks by me in the lot. He tosses the rule book at me and says to show him where it says a bounced itch can be hit. I tell him to show me where it says a legally delivered pitch can't be hit. He mumbles something about me being arrogant and walks away. My partner is laughing and it got me thinking. I know I'm right but can't find it. Any help?