There's no way that a group of socially interacting individuals would behave that way after 3 years of (presumed) isolation. I could see one person talking in that manner if they went without talking or socialization for many years, but I assume they'd catch on pretty quick after coming into contact with another individual.
Even if the rules are that they're not allowed to speak with anyone (even themselves), except in special circumstances like this, I'd still believe they'd talk quite a bit more logical than this. A trash dump seems like a logical place, sorta, to hide from the zombie apocalypse. You could hide your smell from zombies at the onset, most people would instinctively avoid at the onset (and you can recruit, warily, the like-minded survivors that turn up), and as confirmed in the episode, there'd be little reason to leave at first, as much of what you would need would be nearby (food & shelter, at least. Water might be an issue depending on location).
The only way that any of this makes any sense is if, like Ezekiel, Jadis and her clan are putting on a show for Rick (and presumably other survivors they run across). Maybe to pump up how formidable they are in a Mad Max sorta way. But there is *no* indication of pretense here (we got an explanation from Ezekiel right away, and Jesus acknowledged first thing that his name is Paul).
Daryl should've stayed with Carol. He doesn't have to sleep with her or whatever (get your minds out of the gutter), as I'm sure there's room on that couch and she could probably benefit from a watch system at night. She might be Superwoman and all, but she's not that perfect. Plus, Daryl can protect her from half-baked false flag operations. And here's a conversation for you, writers:
Carol: "Is everybody okay? Did the Saviors hurt anyone?"
Daryl: "I'm not going to lie. It's still Hell out there. I've been through things. We all have. But Alexandria's still up. Rick's still in charge. There's an agreement with the Saviors, but it won't end well. We've lost some, we've gained some. But you know all that already. I'll tell you more if ya want. But the past is past."
So, Daryl's going to the Hilltop now. After that, I assume he'll continue his tour of the Washington, DC metro area. Maybe Oceanside to convince them to give up their guns, and then the trash heap to engage in one-on-one conversations with their leader and impress us all with his innate speaking ability.