Ok, here is why "cleaning lady", "dish washer", "ditch digger", clerk, and "menial" don't get the respect that "doctor","lawyer", :banker" do. Those first named positions are, as a rule, not the first choice of those who practice those trades. They are,for many, jobs that offer neither fulfillment nor wealth. It's not just the money, by the way. Artists are more respected because, even if they are not very successful, they are being fulfilled and their lives are rich.
Of course, one can find fulfilment in menial work but most menial workers do it because it is the best paying job they could get.
You want equal respect for all workers? Join a kibbutz, that's where you will find it.