I don’t believe I’ve ever heard a single funny thing (by my reckoning) come out of the mouth of any American stand-up comedian. Not once. All their mannerisms seem exaggerated, and then they say something trite of a somewhat playground level… and then americans laugh.
It doesn’t seem even remotely funny to me… but americans laugh at it.
It is much the same with the horrible pun-threads around here. I’m sure americans are probably laughing at it… but I haven’t found anything like that even remotely amusing since before I was 5.

Different cultural standards… pretty much.

Not sure if British standards of stand-up comedy are regarded by americans as funny. I mean last I checked, the yanks actually ~like~ us… unlike the way we ~dislike~ them. So who knows how it goes as regards the funnies?