So, 6, how do you know that their squabbling is not tongue in cheek? Or does tongue in cheek humor simply not amuse you?

Humor, remember, is a very subjective and individual matter. Some people find Adam Sandler hilarious, for example, but I don't. Some people find obscene language hilarious. I usually don't...but on occasion, maybe. Depends on context and timing. Some people find the subject of farts hilarious. Again, I usually don't...but on occasion, maybe.

Chimps? Almost always amusing.

And "old farts"...not funny at all! Not any more. (actually, I never liked the expression)