Nationalsim v Patriotism.

I's avoiding patriotism, (although also acceptable), because its often a mistake to divide each other apart if its unnecessary. In this case, the vast majority of the US population are not in some MAGA movement/cult. In fact about a third of US voters we can only say have lent these people their votes. However, many more than that would likely accept a nationalistic self image as a fair description of themselves.

I specifically want to counter the idea that to be nationalistic is only a negative thing. Civic Nationalism is a very important thing for countries like ours. The broad designation 'nationalist' shouldn't be surrendered, especially where common perceptions lead to unfavourable results, (see what i say above about likely self images).

Recognition of common interests is also harder if people are speaking different dialects. In this case there is no need to be distanced by that linguistic difference.

By avoiding its use, the broader population can misunderstand civic minded/progressive/left/etc, peoples lack of referrals to 'nationalism' as being ashamed of, or hating, their country.

This (dictionary.com) is a good base for the terms. You're right to assume the negative connotations. Hopefully you see i's attempting to counter the popular use by pointing out its importance.

In the context of my comment about the US flag, i saw someone paint one of those blue line US flags with the LGBTQ+ rainbow colours. In my opinion civic minded US people should be taking back their flag in those ways more often.