[JRutledge]

If the play happen as it was discribed, there should have been nothing to call. You cannot have Basket Interference (need to read the definitions) by touching the backboard at all in the first place. You could have a T if the officials feel that the action was not appart of a block attempt. But as long as the block attempt was missed or simply inadvertently hit the backboard by the defender in this case, you have to just leave this alone.

Your friends did what many do, they listen to fans instead of the actual rulebook. This is one of those "Basketball Myths" that Referee Magazine has written about a few times over the years. This is probably why they did not know what to do.

Peace