I imagine this sentence in a movie where an all-male drug task force tries to infiltrate a strip club in drag.
Yes. Duo sometimes translates it exactly like that to stress the distinction between "you" and "plural you".
If it is "you all are not women" why would it not be "they are not women"? Or would that be considered "de er ikke kvinner" instead of the "dere er ikke kvinner"?
Imagine you are talking to a classroom full of men. You would not say directly to those men "They are not women" you would say to them "You are not women"
How do you pronounce "dere er"? Separately or connecting the r sound from "dere" with the e sound from "er"?
Not exclusively. German has five distinct ways of plural formation, -er among them. While Norwegian is much more homogenous in the formation of the indefinite plural, there are exceptions to the "just add -er" rule, for example ku - kyr (cow - cows), mus - mus (mouse - mice), tiger - tigre (tiger - tigers), datter - døtre (daughter - daughters), bok - bøker (book - books).
I'm having trouble saying the sound for kvinne. Can you suggest a similar sound