We have that A LOT in the vintage aircraft/warbird world as well.
Often times we'll be coming back to our home airport, which is a Class D aircraft - all of the controllers are extremely friendly, etc....
We're coming back in sections (two ships formations) - and we ask for the break (360 overhead pattern). The tower says report the initial, blah blah... we go into a break (somewhat...aggressively), then gear down, flaps down and land.
Well as we're on the ramp... a CFI starts yelling at me for being dangerous, etc in the pattern - he was on the ground during our pattern. He explains how illegal it is for us to do an overhead pattern... so he calls the FSDO from the FBO. We can't wait to hear what the FSDO says.. because some of the guys there fly with us from time to time with the FAST formation cards, etc. All of this is right in front of the CFI's student.
After the FSDO doesn't have a problem with it at all - as an overhead break is a FAST accepted procedure for a pattern entry . He looks like the tool bag he is. Come to find out...he's a CFI with 350 hrs.
He could have saved himself some dignity if he would have just STFU.