When reading this post:
https://movies.stackexchange.com/a/51219/20039
I wasn't sure what the last 3 sentences actually are stylistic about.
So the question is as the title states.
What is the expressing difference between We ain't and We are not?
aint
can be used as am not, are not, is not, have not, and has not. BTW, aint is informal whileare not
is the version you must use in a formal writing.