Emmanuel Macron, the President of France, while speaking to our President, Donald J. Trump (of Make America Great Again fame), said the following (translated):
Patriotism is the exact opposite of nationalism: nationalism is a betrayal of patriotism. [...] By pursuing our own interests first, with no regard to others’, we erase the very thing that a nation holds most precious, that which gives it life and makes it great: its moral values.
The dictionary gives us a definition of nationalism:
patriotic feeling, principles, or efforts.
synonyms: patriotism, patriotic sentiment, flag-waving, xenophobia, chauvinism, jingoism
"their extreme nationalism was frightening"
So, that explains a lot. Either Macron is lying about nationalism, because France is a nation that historically has no interests outside of France's direct interests, or Macron is the most incompetent President that France has ever had.
If the latter is true, then one must ask of President Macron: