So...little old ladies...

...let's say 90 y/o little old ladies leading such bland lives that their form of entertainment has become the "ain't it awful"s and picking people apart.  It would have to piss them off after a while when they say or do something rude or outrageous and people no longer respond just because they "have to be nice to little old ladies".  I know it would piss me off. 

So my question is this: When such little old ladies are staying at your house, and you have gone to considerable lengths to make their stay as enjoyable and entertaining as possible...in the event that every time you go upstairs one of them starts badmouthing you (knowing you can still hear her), would you tell her off?  Would you be able to take it if she were ranting about how lazy and horrible of a parent and a cook you were, deliberately, on your birthday?  Would you shrug it off, or would you get in her face about it, so to speak?