Do you think it might have something to do with conservatives being polite?
I live in liberal Chicago. The libs are not polite. They are rude and have no qualms about offending anyone who disagrees with their PC religion. I can always tell which tenants are from rural environments and which grew up in the affluent liberal suburbs. The tenants from conservative areas are almost always more polite.
Forget about "when in Rome"; how about "Don't piss in the well that you and others have to drink out of!"