Patriotism and nationalism has zero place in society.
Not true. Patriotism is wanting and seeking the best for your country. Because our society relies on those physical divides, patriotism would actually improve society. Nationalism is deciding that whatever your country is doing already is the best simply by virtue of self-identification. There is no desire for improvement outside of an individual perception so it, functionally, can never offer any improvement for society.
One is potentially beneficial. The other is cancerous.