You seem to have made a connection between nationalism and being furious about other people. I respectfully disagree that there is a necessary relationship there.

I have no ill will against other people. I would like people who share my culture to govern me, and I would not like people of my culture governing people of a different culture. They can govern themselves and we can govern ourselves. We can share ideas, trade, sport, etc., But multiculturalism within borders is an inevitable failure and globalism is an inevitable failure

Before nationalism, most European states were monarchies "answerable by God". Now it's dominated by countries with a single people/single language/single religion. Minority rights are important, but a minority should never be in charge of the majority as it was under the Austrian Empire for example (a.k.a as the Jail of Nations).

It's sad that reactionaries are trying to undo this and slowly turn the EU into another Austria, which will inevitably be dominated by the Germans and French.