As a California plumbing contractor, I like it when a maintenance man is around that knows the building, or the shopping mall, or the high rise condo building, but it is rarely available.
I don't recall ever needing anyone to show me how gas lines run from the meter, when you have run gas lines yourself for decades, you get a pretty good idea how things run, and I don't recall that help being available, but it is always nice to have someone around that can unlock doors for you and such. I don't know whether some plumbers used to bully you or what, but it sure is amusing to learn how much you dislike the plumbing industry.
Plumbers never bothered me. Heck I lived and worked amongst about 75 of them for 4 years and not a cross word exchanged between us. Jerks trolling threadss looking for arguements and enjoying themselves while doing so bother me though and I soon loose patience with such persons. Good Day.