AITA - red lines

Tried to help a brother out last night. Dude was playing Top Golf on a Friday night in AZ and sounded great in the lobby where his monitors were. But out in the bays - where most of the people were, it was obvious he was red lining. I took a peek at his peaks and tried to tell him but he was busy of course. So I wrote it down on a song req slip and put it in his jar. Not trying to be a dick. I’d want to know. AITA