They are not punching down. They are punching up at the richest and most powerful country the world has ever seen which might invade their home soon. Are you really going to spend your time tone policing children from Greenland?

What you listed are extremely mild stereotypes that Americans have heard a million times even from other Americans. They are about as offensive as “French eat croissant” or “Brits drink tea”. And these kids clearly want to be offensive to Americans

All the former eastern block countries (including east Germany, also Yugoslavia) are stereotyped as poor, which carries further stereotypes of criminality, stupidity and general backwardness. There are old German jokes about how poles will steal your car for example.

I would say that its slowly getting better as the economic situation of our direct neighbours improves, but that may well be my bubble, wich is mostly made up of university students. Far right parties are on the rise and I doubt their voters have very nuanced views about any foreigners

When do the tarrifs actually go down?