What would you do? As in, what have you done in the past yourself?
I've learnt that a lot of fussy customers on the first clean are so, because of bad experiences themselves and once they have seen how you work etc, they end up being some of the best customers. However, this is not always the case.
It will help your employer build character, as being self employed or employed you can't be over sensitive over other people's persona. So, stick it out and see how it develops, would be my advice