In a way, you're all correct. Repetition is a very common comedic technique. In fact, some things wouldn't be funny at all without the repetition. However, it can be especially annoying if it does not tickle one's funny bone. As a result it can lead to direct antagonism. Mr. Navigator is legitimately annoyed at Mr. Crowner's joke, but Mr. Crowner's joke relies on the repetition and the fact it is supposed to be inherently annoying. So, I suppose, the solution in this case would be to scan or just skip any post of Mr. Crowner's if you are Mr. Navigator.