They should be reffered to by their actual title - meter-maids (this includes the guys). they should also be allowed only to (as their name implies) clean the meter. Sub-human pieces o' dirt.
Metermaids are not human. They hatch from eggs at the bottom of the sea. They're shape-shifters, which is why they take human form when around humans, but they can never totally understand the forms they take.
They are not even a single entity at street level. They are actually a hive colony of earwig-weevil crossbreeds that take the shape of a bipedal primate. That writes tickets.
Still not as bad as tow truck scavengers who haul out of no-parking spots within 30 seconds. They're made of leeches and feces.