While I have seen the occasional ambulance person have a bit of a go at timewasters, most won't say anything because they are afraid of getting a complaint. The people who call ambulances for stubbed toes and other rubbish are usually the ones who also 'know their rights and pay their taxes', and are the first ones to be on the phone to HQ complaining about the 'attitude' of the ambulance crew. Even if there's not much substance to the complaint it will still mean an investigation, lots of paperwork, a few interviews and a load of stress and hassle.