(it applies to pretty much any country though .. which norm (in the mathematical sense) are you using exactly ? I don't think there is one and only one.
It works with other countries, too, eg. https://s-media-cache-ak0.pinimg.com/736x/12/27/22/12272295f...
(note: comment intended to be "funny".)
And well, you in France also have your share of quirks. When I am in the US, and my English is less than perfect, everybody is still happy to continue conversation with me, encouraging me to speak, and generally very friendly and helpful. While if I am in France, and my French is less than perfect... well, usually I am getting a different treatment. (And heavens forbid me to start a conversation with anything else than bonjour or bonsoir!)
Heavily ironic when this applies in the country of freedom.
For any "outsiders" lurking here... discuss it! You'll take a social hit from certain types of people but future generations will thank you.
Having lived in various countries that seem to be able to handle critique quiet okay, it'd be a really pitty to just shy away from it in the US. A boastful bully often needs to hear that they are not the most fantastic person in the world. I mean, good self estime is great but so is some humility, even when it comes from the "outside". Actually it's often the person from the outside that is the only one to see the difference starkly enough.
Now I have a very positive impression of the US overall, but it seems strange to ask a question in casual conversation might not like the answer to.
Anyway, asking these things I guess is pretty universal.
Also in SF you'll get a bunch of self-hating people who haven't traveled much who think the U.S. sucks, just like in Alabama you'd get a bunch of irrationally pro-America people who haven't traveled much and don't see why the U.S. can suck with certain things.
Before Trump got elected I would always get an angry glare and trigger defensive responses whenever I'd point out some aspect of the US that I felt could be improved or was lacking when compared to how things are in Canada.
After Trump it's a bit different. I think his election has been a bit of an eye opener for a lot of people that there really are deep-seated problems and maybe striving to be more like other countries that do things differently isn't such a bad idea.
Of course, that's just my experience living in a big city where my social circle is overwhelmingly liberal (which easily also applies to SF). I'm sure things are quite different in more rural/conservative areas of the country.