this is such a weird debate to have. have these people never been to a foreign country? I feel like they're just trying to not be prejudiced in place of observing reality
so what are you suggesting causes, for example, the French to strike more often than other Western countries? or Japan to typically have particularly low inflation? or Argentina to typically have particularly high inflation?
Unless we disagree on the meaning of "national character", isn't that easy to come up with 100 other reasons to explain those economic/political differences?
History? Geography? Specific laws? Particular parties in power?
There are a lot of things to look at alongside mystical notions of a collective national character of a people, especially now that most of these countries have significant immigration and exposure to ideas from elsewhere.
all of the things you listed make up or result from national character. besides some short interludes, for example, Japan has had the same party in power since 1955. it's a weird thing to deny the existence of. different nations act differently. it's not heresy to make generalisations, particularly in the age of nationalism when many/most people actively try to set and follow their country's norms
Waiting for the country of people who fly out of their mother's wombs or whom are born in a sack on their father's backs and further those who mentally convince themselves to pass through walls.
so there not being the difference between a human and a kangaroo or a frog and a bat means that the difference between an Argentine and a Japanese person isn't real either? literally meaningless analogy