Frank,
Setting aside the temptation to girl-slap him and take the beverage into protective custody ...
I prefer reasoned direct confrontation, thus:
What a novel concept - "good enough". by that measure a skilled metal worker can displace the licensed structural engineer, make changes to the load-bearing components of your home, and hopefully they are "good enough".
How about the desert chef who subs for the meal caterer of your major event? He's far better with pastries, but perhaps he is "good enough" that all of your guests won't get food poisoning.
Someone may be very skilled in a particular area, or specialty, but it is a false equivalence to wave your hand and say "good enough".
That kind of BS goes out the door when someone wants the best they can get/afford, and gets a dismissive "good enough".
I used to prowl the main-spaces in coveralls when I was in the Navy, and would go off on repair workers when I heard "close enough for government work" around major equipment. My rant was some variation of [critical equipment] will operate at ~ 1300 PSI/ 900 degrees F, and my guys and I are going to operate X and stand watch around it for the next 6-18 months. It either passes spec or it doesn't - don't give me "close enough".
