M: How about going to see that horror movie? F: Never! / No way! M: Why not? You always talk about the movies you watched [ saw ]. (Sorry, this kind of response makes no sense to me, Kenta; it is a non sequitur. And I don't know what to suggest instead; I don't know what you are thinking of.)
I understood your sentence to mean that the person is always talking about the movies he sees, so you thought he would like to see another movie. It doesn't relate to the horror movie, but it isn't totally unrelated.Maybe you meant
You are always talking about the horror movies you've seen.