Idk if people hate EMS or Paramedics..
But if anything they're easily forgotten, lost in the shuffle behind Fire and Police.
Doesn't help when there's lots of ambulances run by FDs, and lots of those by Fire/EMT, Fire/Medics, who solely identify as Firefighters to the public first and foremost.
Combined with much better PR that Fire Departments put out vs ambulance services, civilians who's only regular encounter with EMS is seeing the occasional ambulance driving by don't think about EMS as a seperate service.