It is said that once at a party, he asked a very beautiful and rather obnoxious woman to go to bed with him for £1000. She ummed and ahhed but finally agreed. He then asked would she go to bed with him for £10. She exclaimed "Do you take me for a whore?" He replied "Madam, we've already established what you are. All we're doing now is arguing about the price."
(It is also said that GBS once tried to get shirty with Bram Stoker, the author of "Dracula". Stoker, a noted athlete, flattened him with one punch.)