When I see my staff take a step back because I've lost my cool about something food-related I say never apologise for your standards. If someone doesn't meet them then you should explain that and that you want it changed. I want my staff to be like that too.
I don't have a set of tenets but I live an ethical life. I practice a humility that presupposes there's a power greater than myself. And I always believe don't inflict harm where it's not necessary.