I'm American and I support America.
I'm American and I oppose America.
I'm European and I support my country and/or oppose the EU.
I'm European and I oppose my country and/or support the EU.
I'm of other nationality and I support my country.
I'm of another nationality and I oppose my country.
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As for 230 year old ideals, to me that depends on the idea. For instance, the first ten amendments I find to be rather timeless. Perfect, no, because everything can be improved with enough foresight, but I'm fairly firm in the idea that they (the ten amendments) should remain largely untouched while this country remains.
I'm not particularly patriotic, I don't feel any particular love for my country at all, the only time I even become remotely patriotic is during sport. I don't see why supporting the EU goes hand in hand with opposing your country either, or vice versa. Although I do oppose my current government's obvious dislike for the EU. Getting rid of the royals would make me like my country more, I'm suspicious of anyone who lives here who is happy to be a subject and doesn't want to become a citizen.
Personally, I feel you have to be pretty stupid to be patriotic about what country you come from, you were born there by chance, and it's more than likely that you have done or contributed nothing of note to the things that you think make your country great.