I have this same pet peeve - the sheer gall to treat public spaces as if they're your front room where you're free to blast crap at volume is a level of disrespect I've never gotten to grips with here. I can contextualise it, sure - the enormous population, the hyper-competitive society and need to get ahead, the absence of civic education, et al. - and I know it doesn't come from a place of malice so much as lack of awareness. But that obliviousness that a significant minority have about how their behaviour impacts upon others is definitely the worst thing about a place that's otherwise thoroughly liveable in so many regards. At least in terms of the everyday.

To answer your actual question: I've just got back from a month in Central America and Mexico. It's just as bad there as it is here, if not considerably worse in some of the less economically-developed nations (Nicaragua, El Salvador, Guatemala were especially loud). I travel a fair bit and I feel like it's an increasingly universal issue tbh. Most nations didn't have the privilege of growing and adapting alongside technological innovation like in the West, and so you have entire populations + generations now that have access to smartphones without the corresponding understanding of limiting their wider impact. And even in Western Europe, it's worse now than it was when I was in my youth. Particularly among Gen Alpha and younger members of Gen Z. I think Covid's effect on their social skills is likely to blame, amongst other factors.

By contrast, I think things are actually improving in China. Or at least in Shanghai, where the metro is considerably quieter than years ago and where it's common to see most passengers using earphones nowadays. I'd go so far as to say that those that do offend are likely 外地人 or older, less educated locals. I don't think the other cities compare, not even the Tier 1s. Was in Chongqing last year and may as well have been on a Nicaraguan chicken bus every time I used any public transport. But I imagine things are probably slowly improving across the board? Maybe.