It depends on two things Hrothgar.
1 is whether the person criticising the joke has got a sense of humour themselves.
2 is whether the person criticising the joke likes or dislikes the poster involved.
I for instance have a regular anonymous [they think] Guest who trys to put me down, and I hope one day she will realise it is a waste of her time.
So it boils down to whether you find something funny or not.
Giok