For some reason most of my partners have ended up being Cincinnati refugees. So I think I can second this. "it's a good place to be from" is a common refrain.
as a Colorado native I've disliked most every other person I've met from the state elsewhere, no particular reason outside luck of the draw I think
why is letting off steam indicative of a weak character? I think that when under stress, it's actually indicative of someone being emotionally intelligent to recognize they need to let some stress out and find an avenue for it. I can't explain exactly why, but swearing has always been a pretty effective way for me to let out some stress mid conversation while staying focused on a problem.
some contexts call for aggression. i.e. If someone's making me or someone I care about uncomfortable in public, it can be pretty useful to bare my teeth back. A simple "fuck off" doesn't require me to engage with any of their bullshit at all, gets the point across, and carries it with a mild aggression that actually does make people fuck off much of the time.
it is imprecise, but in many contexts it's precise enough to convey displeasure and dismay enough to get the point across. In fact the power of "fuck you" is in how concise yet universally applicable and understandable in so many situations.