With the occasional, and I stress occasional, customer who decided that they do not need to comply with various regulations (in another industry BTW) and feel that all the rules should be broken just for their individual benefit, I usually use the following: -
As a company we have no choice but to operate within the laws and regulations that govern us. Is it not fair to expect customers to do the same?
If you don't agree with them, please feel free to take the matter up with the relevent government organisations.
Yes, within the above we will all do the best for the customer, but there are limits over which other customers will suffer just for the benefit of one!
But in this dog eat dog world, what does one customer care about others or the effect their demands have on employees and companies?