People most definitely act like it, but "utopia" generally has a negative connotation, so people don't say that word specifically.
Canada, which shares many many issues along with the US, is constantly spouted off about as "the most friendly" with incredible "this" and "that" and people OFTEN bring it up as the best place you could move, if you were say, American, and didn't like America for some reason, with the idea that it would somehow be better, when it very much wouldn't. Canadians and Americans have an absurd amount in common too, it's not just the nations, especially when we start comparing state by state within the US, as opposed to believing that the entire US is one single minded people. Don't get me started on how much harder it is to even get in to Canada, but of course, people don't scream at them for not letting in Mexicans who want to escape their homes.
Like many places posited as "so much better" than the US, they're generally far smaller, with smaller issues, and people are unwilling to believe, or understand, that many issues in this world are not linear, but exponential in nature.
I'm partial to the idea that other countries aren't spying on everyone and anything they can get their hands on, just because they haven't been found out yet.
My favorite "utopias" people bring up, are the ones where everyone is white. That's the best. It feels super not racist. Homogeneous countries in general are often purported to be "better" in many ways, and somehow "less racist" while being EXTREMELY "xenophobic" and without much ability to show their racism off, as they are, by definition, almost entirely one race.
Diversity and differences in cultures and opinions can't easily develop in small countries, where everyone shares a similar background. Often the amount of immigrants in the United States is literally more than the population of entire countries, including Canada, but absolutely the very small countries people oft parade around as especially amazing. How could they POSSIBLY have comparable situations, or solutions for said issues?
It doesn't stop people from discussing them as if life their is akin to a utopia though, while portraying life in the US as dystopian in nature, and proclaiming that it's actually a "third world country" with a clear lack of understanding how much better life is in the US compared to these other places.
But sure, no one said specifically "I live in a utopia" or "x country is a utopia."