Hmm, interesting. I've only ever heard "ginger" refer to a certain type of colouring. Someone with with pale carrot-orange hair, really light skin, freckles, and pale eyes = a ginger.

Matt in the show looks like he had copper/auburn highlights, and only then under certain lighting conditions. To me, calling him ginger would be as weird as calling him "strawberry blonde" because he's dark-haired in the show. Even "red head" would be a stretch.