Why are Republicans generally more patriotic than Democrats?

We had a thread around the 4th of July with some of those sentiments. Someone offered an analogy about pointing out the flaws of one’s spouse during your anniversary dinner, or something like that. I don’t think “maybe the 4th of July is not the best day to harp on America’s flaws” is really the same thing, or even particularly similar, to “unquestioning support for the actions of my country regardless of whether those actions are right of wrong” / “If you somehow dared to think that there were things that were wrong with our country, you were a damn commie” / “thinking that the US can do no wrong and that we must support the president, so long as it’s a white male” / “my country right or wrong”. In that thread, I personally wrote this:

I don’t know if I’ve ever heard someone say the phrase out loud, but I’ve seen a handful of bumper stickers with that printed on it before. Seeing it once or twice a decade on someone’s rusting-out bumper has given me the personal impression that it’s not a particularly-widely-held attitude. I haven’t read any studies or surveys that have attempted to quantify how widely-held it is. Have you?