I think "respect ____" and "be respectful of ______" or something to that effect is the differentiating thing for me. The phrasing of the former has an element of martyrdom/exaggerated sense of importance, whereas the former is just basically, realize the job sucks and don't be rude for no reason.  Having respect and being respectful are two different things.  Edit- I work retail. It's pretty much just  "don't treat me like I'm below you just because you're shopping and I'm working, and ideally be understanding of my limitations - if we don't have something, for instance, it's not a personal failing of mine; please don't be nasty about it"