A lot of this is related to inequality, value of labour detaching from wealth, and the increasing unaffordability of life. The material conditions of regular people are continuously getting worse as more and more of their income is stripped away by rent seeking oligopolies, mainly increasing housing costs but depending on your jurisdiction all sorts of other costs (eg. cable and mobile phone costs an issue in some pl…
At any rate, blaming the problems on inequality seems a lot like seeing everything as nail when all you have is a hammer. I'm not sure why OP's complaint that people don't care as much, or that they are loud and inconsiderate, necessarily has anything to do with inequality. The might feel like there's no chance to get ahead so I'm just going to not care and act inconsiderate. Or they might just be selfish, perhaps because we have ads constantly telling people "get the X you deserve". Or they might be selfish because that's human nature and since society rarely goes to church any more (only 31% attend weekly, 42% at least once a month [1]) they don't hear anything telling them that selfishness is "wrong". I'm sure you can think of other reasons that have nothing to do with economics or oppression.
Furthermore, I'm not sure that inequality produces not caring or inconsideration. Take the 1920s, which had higher levels of inequality than now [2]. People born in that decade are part of the "Greatest Generation", known for their self-sacrifice, not selfishness. My impression is that civic mindedness was actually a thing back then. And it's hard to tell what is representative looking back 100 years, but the buildings from that era seem to be well-built, and you see pictures of working class people in suits (I've seen one with men lounging around a seawall in suits, which you'd never see today). So I dispute that inequality necessarily produces what the OP complains about. (I also think the OP is also not seeing the unpleasant parts of the recent past.)
[1] https://www.statista.com/statistics/245491/church-attendance...
[2] https://www.researchgate.net/figure/Historical-economic-ineq...