Well from an anti-state perspective, supporting a country that commits radical acts such as monopoly of violence is by extension radical

This view is flawed because it mislabels the state’s monopoly on violence as inherently radical. In reality, this monopoly exists to prevent chaos by centralizing and regulating force. Calling it radical ignores the distinction between structured authority and unregulated violence. Supporting a state doesn’t mean endorsing oppression, it can mean recognizing the need for order over anarchy. The reason why humans have evolved to favor order over anarchy is because order provides stability, and this allows people to built up complex societies in relative safety.

I’d say tankies are also patriotic, just not for USA. Fatherland is a quite important concept in post-leninism forms of authoritarian communism. From my experience, it’s much more common to find anti-patriotism in libertarian communism / anarchism than in despotic communism.

Patriotism at it’s core is just a sense of pride, and that’s a universal emotion that everybody has. Everybody wants to feel like they belong to something greater. It gives us a feeling of nobility. All people share a feeling similar to patriotism, even if it’s labeled as something else… even anarchists.