There is no need to indulge them: you just tell them you are not going to sort the M&M's. If you do that in advance: great. If you ignore other points and tell

There is no need to indulge them: you just tell them you are not going to sort the M&M's. If you do that in advance: great. If you ignore other points and tell them in advance also great. If you ignore requests and don't communicate that fact you are in trouble. Like the 15 amp sockets which can deliver 19amps in a comment above. That's a fire hazard. If you don't start a discussion that it is a fire hazard and you will only deliver 15amps or you will use a different higher rated socket you failed the test and your work is suspect.