Did you just listen to what you posted? You call people trailer park folks. Who is that? Do you know many seniors live in trailer parks. Are they trash.
People can’t say “ghetto trash”, but they can sure throw out trailer trash.
So, who has a problem. Them and you?
It is a generic term meant to convey something. Not to insult any particular individual or group of individuals.
That’s part of the way the English language works.