Long standing customer (several years) said to me: "Is it worth doing it while the weather's not so good?"
I said: "How long do you think I would stay in business if I could only work in spells of good weather?"
His reply: "No disrespect, but I don't care about you."
I didn't lose my temper, or even retaliate. "Revenge is a dish best served cold" - I shall just not do them anymore, and when they call to ask why, I shall say: "I'm sorry, but every time I scheduled them to be done, it looked as though it might rain."