First, I don't fully understand the term "patriotic", I don't have a use for it in daily life.
Does it mean "I love my country better than others"? > OK, familiarity makes you love things better. You love the "home" where you live, the wife you say hello to every morning, the slippers you've grown used to...
Dos it imply "my country is better than others"? And how would you measure such a thing? In terms of money, because you have better life standards? > But, even if it is true, what if such wealth has been obtained, as you mention, through foul means (bloodbaths, the systematic murder of opposing voices...)?
I've never felt "patriotic" towards my country in the usual sense. A country is just a line on the ground. However, I do admire things that are characteristic of the people in the country where I live. A certain way of being and looking at life that has a particular "flavor" to it. But it happens only in some of those individuals, the best of them. Dumb guys are internationally equal. So seeing a banner does not wake emotion in me, as it includes both the brilliant and the dumb guys as well.
I also hate the mistakes made by my country's government. We also have genocides on our back. Politically, there's nothing to admire. I guess it would be the same in ancient Rome; Virgil would probably, in private, abominate of the continuous massacres fostered by his government. That didn't avoid that he wrote the Aeneid, which is a masterpiece that only a cultivated Roman could have written.
The US is monstrous in a lot of ways, especially in the political sphere. But there's also, among their best exemplars, a way of looking at life that's unique there, and that's what I can admire; the lack of pretentiousness, the practical sense, the aspiration (work in progress) to equality among people, the capability for teamwork, the snappy storytelling... I agree with Leonard Cohen, who called US "home of the worst and of the best".