Sometimes, walking away, from their conversation, is appropriate.

Or just grumble, Oh, not 'this' again... and walk away, get to work. Blunt statements, in a kitchen work. Hey, I don't want to hear about it, take it elsewhere. How am I supposed to measure, here, when I can't hear myself think?

And about those padlocks. I lock fridges and freezers, too. It's employee theft. I'm sure, you must have signed paperwork?