Here's a question, why does it matter? They aren't real. The art is used to convey themes and emotions. In this scene we are in her perspective mostly. She feels small, and he is a big wall in front of her that she has to face.
Ofc the art will reflect that.
Does it look bad bc it's not realistic? If so why does everything have to depend on realism?
Art styles are stylistic for a reason.

The height difference is pissing me of, like why this man is titan sized his dick graphically is reaching her chest like what are we doing