I work with Americans who are sarcastic, ironic, and often self-deprecating.
So, either I know some odd Americans or some people are too quick repeat trite stereotypical views in order to make themselves look superior.
“American’s don’t do sarcasm”, er like, hello?
Well I’m guessing that Reginald D. Hunter has worked with a few Americans and apparently he disagrees with you concerning the difference between British and American humour.
And I’m happy to accept that Reginald D. Hunter is probably something of an an “expert” on comedy and Americans, and isn’t simply motivated by “trite stereotypical views”.
5.25 mins into this video :
(and 1.10 mins and 2.30 mins)
So I would plumb for ‘you know some odd Americans’.