The premise of this question is stupid. Most people in the civilized world believe the death penalty is bad and should be abolished, so should I just change and go along with it?

Just because a behavior or thought is popular around does not automatically mean I should change mine.

Yes I think loudness is ignorant. But that is their choice. There are far worse behavioral problems that should be changed because they have real consequences.

It depends on the situations. I know Chinese hate loudness at night. So many people complain about it (I even had one asshole who lived near me in Beijing complain that my room mates and I were loud at night. We were always careful to take our shoes off, keep the TV turned down, and not talk loudly like peasants--but he fixated on us because we were foreigners. He even told me that we should learn to be quiet like the Chinese). And yet, I hear someone hollering in the halls of my complex every night.

When I was teaching relative clauses, I had my students brainstorm lists. One category was 'people who annoy me.' Every group listed people who talk loudly in the libraries and in the dorms at night....but they also admitted that it isn't rare. So, people think that it is rude, but do it anyway. Just like I tell students to be quiet in my class--but have to do so several times.

It mostly comes from migrant workers. People who come from tiny farmer towns. Old people are so damn loud. Real city folk are generally much more quiet but even then they get louder and louder as they get drowned out.

But no I dont think its considered rude here. people just accept it and turn the tv up louder. We seem to be the only people who complain about it.

Again geography might play a role, but I find Cantonese people under 40 to be very meek and quiet

As others have said, the behavior of Chinese children towards their teachers. I was expecting polite, respectful, hard working children who revered their teacher. Instead, 80-90% that I've encountered are silly, immature, rude, obnoxious and lazy.

I also expected less economic development. I started in a Tier 3 city way up in the north and figured it would be some kind of barren Siberian wasteland (was kind of hoping for that) but ended up in a sort of modern city.

Yeah, you are right about "MOST CULTURES"

cuz now I think about it, It was much more louder in my home country

Spanish people are considered loud, as are Italians: have you ever been present when they talk about football or argued?

In China it is loudness 'with Chinese characteristics'