I don't thin one should take offence at that.
However a while back now, we had tradesfolk sorting out garage issues, and they were happy to accept the occasional mug of coffee. Then on one occasion we opted to treat them to one from our bean-to-cup coffee machine instead of the usual instant. Even steamed the milk, it had a nice lot of frothed milk on top. We discovered later one of them had sucked the frothed milk from the top, but left the freshly ground coffee untouched !!! Wasn't overly impressed. Moral is, don't waste your good coffee.