By the look on the faces of the two lounge receptionists, you'd think I'd asked if I could take a dump on their desk. "Other people have paid membership to use this lounge" I was told in a rather disdainful way. "Sure", I said, "would you like to put a value on the fact that I will never fly with you again then?", I replied...silence - they stopped talking to me and carried on doing other stuff as if I had suddenly become invisible.
No, I did not get to use the lounge, and no, I have never flown with United since - which also means that work colleagues who travel with me are also lost to them.