Slapping Backboard on block shot attempt?

[jritchie]

this happens a lot on the higher levels, and a lot of officials call this basket interference or goal tending and just count the basket.... the correct call supposed to be a technical foul if the slap causes the ball to miss...is there a reason why some refs ignore this rule and call something that is not even possible by rule?????? Or is there a different rule at the college level(ncaa/naia) than in the high school level (nfhs)????