I would not have replied, but I thought your response was polite and to the point.
I think this joke sums up my attitude to 'interesting' customers...
Two women in a maternity ward, just had their babies and are chatting.
The first woman (posh speaking) says 'My husband bought me a car when we had our first child'
The second woman (common speaking) says 'that's nice'
The first woman continues 'My husband is treating me to an expensive holiday, now we've just had our second child'
The second woman says 'that's nice'
The first woman says 'did your husband buy you anything?'
The second woman says 'yes he bought me elocution lessons'
The first woman says 'really, they haven't worked very well'!
The second woman says 'actually they have...I used to tell people to F-OFF but now I say...that's nice!