Thanks for the story John.As I said, there are parodies which come out of love for a song, and parodies that take the piss.
On another thread recebntly I asked if anyone knew of a version of The Mountains of Mourne in which Mary writes back to her young man acidly commenting on the fact that he seems to spend a lot of his time looking at the ladies he's telling her not to copy.
Noone came back with the song so far - but the point is, that is a parody growing out of and respecting the original song.
And I tend to share Blackcat2 impatience with performers sneering at the people who ask for a familiar song - and that is what can be implied in the type of "Don't ask me to sing" song, and is very often implied in the way singers react to a request for a "hackneyed" song.
Mind Enda Kenny's song "Don't ask me to sing the Wild Rover" isn't actually doing that. (And I know there was a thread about this recently.)It's about moving on and accepting change. And not letting feelings of nostalgia and homesickness get in the way of living in the present.
Kevin