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

When do the tarrifs actually go down?