Yeah I guess I probably would, if it happened right away like that.
But if I made a joke and nobody heard it, then somebody used a similar joke in a situation where lots of people heard it and enjoyed it, no problem.
I guess I don't really see why it matters who's telling the joke. The point is, the joke got out, and more people got to enjoy it.
If people held back from telling jokes because they're afraid they're going to hurt the feelings of someone who told it before, fewer jokes would get out.