So obviously I don’t know that exact number for sure. It’s an estimate that just seems true to me. The point is people aren’t as funny in general as they believe, and this causes a lot of problems socially. There are few things more cringe than someone trying to be funny when they’re not. Or just keep on hammering a certain joke etc.
I feel like we are all probably guilty of this at some point. So to counteract this, just consider yourself 60% as funny as you think you are. If you made 6 jokes, let the next 4 go unsaid. If you think a joke is really funny, just repeat it 3 times instead or 5. You get the idea. This belief really helps reduce annoying ness.