How to unpick that nonsense is a challenge. Plus i have had a beer today and my head is not really on it.
Lets start with your assumption that people give everything away to make a Communist society. That has to be one of the most idiotic statements I have ever read, read some Lenin and come back to me when you are you educated.
Orwell said of Nationalism
"identifying oneself with a single nation or other unit, placing it beyond good and evil and recognising no other duty than that of advancing its interests"
He went on to say
By 'patriotism' I mean devotion to a particular place and a particular way of life, which one believes to be the best in the world but has no wish to force on other people. Patriotism is of its nature defensive, both militarily and culturally. Nationalism, on the other hand, is inseparable from the desire for power.
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Orwell is prescient here as he indentifies that Nationalism is all about power, the power to shape society in a way that expresses nationalistic desires.
Nationalism even gets dismissed by minorities is our society
Muslims believe that Muhammad condemned nationalism in many ahadith, stating "Whoever fights under a banner of foolishness [tribalism], supports tribalism, or gets angry for the sake of tribalism, he will die in a state of ignorance". When asked about nationalism he answered by saying "Leave it, it is rotten
Invoking Godwins law here is a quote from Adolf
"Certainly a government needs power, it needs strength. It must, I might almost say, with brutal ruthlessness press through the ideas which it has recognized to be right, trusting to the actual authority of its strength in the State"
why though are we facing a rise in nationalism?
It is multi faceted, there are the scare stories from the right, there are the conspiracy theories like the great replacement theory and the klaus schawbs plans for the world to become one global entity. This scares people as Zen said people indentify with place and rightly so.
However in my opinion, Nationalism is poison, I am a patriot, but i do not subscribe to nationalistic ideas of overt power because i am a democrat.