From what you said, I don't really understand why they don't like using different layers. It's a moot point, anyway, you're probably not going to change that.
"Boss complains about standards but they're the ones he made up." If he's the boss, that IS the standard.
I'm not THE boss, but sort of "A" boss, but was the only one in the office doing AutoCAD. We hired another engineer, who insisted on doing his drawings his way. Then one day, he says "We should have some standards for this." Well, duh. My way WAS the standard until he did things differently.