Level of intelligence, done people tend to be poor and have lower emotional intelligence as well. Less intelligent people have less shame and don't care what other people think of them or think its cool or to stand out in a crowd making a scene. But mainly because they are fucking stupid.

the wealthy teach their kids repeatedly from a very young age and on, that "we do not air our dirty laundry in public. when in public one is to act as a lady or a gentleman, and not air our personal grievances for the world to see. As that would bring shame upon our house." and that mantra is repeated all of their life until the time comes when they are the one repeating it. It has been my experience that the houses that live by that sort of code are the houses that have the most heinous things to hide

Also those who swear/curse loudly in public places.

A couple of years ago, I was taking my daughter to get a new cell phone. We were looking around and I heard a couple behind me talking. Man: "Get any phone you want" Woman "Oh my fucking God! Are you fucking serious? Like fuck, if I got this fucking phone, it would be like.....fuck".

My daughter side eyed me and I quiely told her "without looking, they're trashy and they're not going to leave here with a phone".

As we're doing the sim card swap and putting on the projective screen cover etc, that couple loudly says "can someone come fucking help us? We have fucking money to spend".

An employee calls them to the counter and I get my first look at them. As trashy as I imagined by their voices. They start the process giving names and other info. Suddenly the associate tells them "You're going to have to put down a $500 deposit". The bitch shrieks "WHY THE FUCK WOULD WE HAVE TO DO THAT"? The worker replies "because you have bad credit. You don't lose the $500, you'll get it back after 6 months". The man yells "NOBODY HAS $500 TO JUST DROP LIKE THAT" and they storm off.

Because unlike wealthy people they can't afford to simply make a phone call and have their mate killed and disposed of at a later date in a more private setting.

My SO doesn't understand why it is inappropriate to talk about our money/finances in public. Pray for me.

Fuckin' underclass trash btw.

Exactly what I wish to escape from.

Status.

For wealthy folks both parties will take a status hit for a public argument because they start above zero.

Trash starts at zero and feels that winning a public argument can increase their public status. (They have a potential upside)

It is a class thing. Poor people are more likely to be trashy. This isn't to say that all poor people are trashy.

Black women are by far the most common to argue publicly, either in person or on the phone.

Alcohol.

Attention whoring.

Stupid/attention seeking/want pity