"No, authoritarianism is not inevitable, and no, it's not okay just because it's familiar and common."
I never said it was okay, however I would like to know just where is this utopian country that you are holding up as an example of anti-authoritarianism? (and it needs to be comparable to the US in size because otherwise the managerial challenges are not equal) Because after thousands of years of history man has had plenty of time to achieve it. If authoritarianism is not inevitable as you suggest then we should have multiple examples of this utopia by now. It's one thing to "believe" something and entirely another to "prove" it. Hypotheticals are for burning straw men.
As someone else has pointed out, what a lot of us are celebrating are ideals that were set in place a couple of centuries ago and not the twisted deeds that the government has committed since then. As the founders writings indicate, even they who were trying to start a non-authoritarian government were not naive enough to think that it would survive for long.
Additionally, you will need to lose your arrogance and learn some humility before you approach anything resembling moral superiority.
RE: Patriotism, an Abomination