Yeah, definitely sounds like you said the wrong thing.
Sometimes you just have to bite your tongue and steer the conversation in a more friendly direction. It sounded like maybe she was using a super loose RPG definition to be playful, maybe she doesn't really like RPGs. I don't know, but either way, you probably should've latched onto the fact that RE4 is a pretty good game.
Maybe you could apologize? Or maybe it's just another lesson learned.
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I'll brave the storm to come, for it surely looks like rain...