Maybe ignorance really is bliss?

Yeah, I hear you. But Blogger Bob over at Propaganda Village (see link in my previous post) as much as said it was too much to expect their little brains to deal with all those slide-tables and log-rules to calculate the volume of toothpaste when it's labelled in weight. So they've just decided to ignore established definitions and pretend that oz (fluid) = oz (weight) = oz (merry old land of).

If you got metric toothpaste marked in grams not ounces, you should be okay as they probably won't know what grams are. I don't want to discourage you from challenging them, but I predict you'll get a typical "just following rules" reply. Or D.Y.W.T.F.T.

Always remember that we're dealing with an organization that thinks "frozen liquid" is a state of matter.