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Here are some interesting pieces that I've posted before.
From top left:
Red CMF S5 Royal Guard x2
Red CMF S5 Woodsman x2
Red CMF S11 Mountain Climber
Red torso with red arms
Red S13 Female Samurai
Dark red S14 Zombie Pirate
Red S2 Lifeguard
Red CMF S5 Woodsman
Red S2 Lifeguard
You can see that some of the red arms react and some don't. CMF red minifig body parts seem to react nearly universally from what I can tell. I don't have a lot of newer non-CMF minifigs, so I can't say if it's because they're CMFs or if all new red minifig parts react.
