My personal headcanon for the movie version of Rogue is that she still has a lot of her naivety and innocence. She’s been sheltered in the south with two parents and a roof over her head and it just hasn’t occurred to her that people live in other ways. She’s losing a lot of that as she travels by herself, but just the fact that she would climb into the back of a strange man’s trailer ‘hoping for the best’ means she hasn’t lost it all. She’s definitely still learning how people work.
So when she made a comment about his living situation, I don’t think she was trying to be hurtful or flip, she was just expressing her surprise and didn’t realize how it would sound. And that’s why she backpedaled right after.
The biggest difference to me between movie!Rogue and comic!Rogue is that comic!Rogue has lost most of that innocence and when she says something, she knows exactly how it’s going to come across and who it’s going to piss off.