It’s not quite like that. I think it’s more a matter of
how old the strips are.
A lot of the national stereotypes were heavily exaggerated in
earlier characterizations.
Ex: Germany is in fact noted to be humourless + jokes go
right over his head.

In newer strips, the stereotype remains with Germany, but not
nearly to the same degree.
His humour is subtle and less explicit. In other words, he
does possess a sense of humour, a pretty sly and sarcastic one, but it’s not expressive
or obvious.
Ex: He takes a photo of Italy when he makes a silly face.
