I'd like to suggest a different reason for the likely judgement: You didn't see the obvious (in his view) sign for the fitting rooms.
Neither of you has to be 100% wrong in the situation. Just because he spends up 40 hours a week seeing that sign and 100% thinks it is GLARINGLY obvious doesn't mean you 100% didn't even try looking for the sign and possibly distracted him from a (perceived) important task to make up for your laziness.
It's a balance. You can both be 50% objectively correct or any variation of levels. The sign could have been higher or lower or a different look than you were used to AND you only glanced around and didn't really stop to look.
I know for a fact that I've been on both sides of this kind of scenario. Would bet most could find one of each in their lives, too. So it's a learning experience, remember that what is obvious/simple for one person (you/someone else) isn't obvious to another person (someone else/you) and try to act accordingly.
But the fart comment is very insightful, you know?
Trickle down? It was called VOODOO fucking economics in its day. Plenty of analysts and other people with half a brain understood what a travesty it was and is. BUT too many people at the bottom of the food chain keep getting convinced that it works. :/