Why is he weak to MAGIC?

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>Weakness to Kryptonite
The symbolic weakness and a radioactive element from his home planet, makes sense.
>Red Sunlight
Red stars don't emit different light (all stars emit white light) just less of it, which means only red light is visible after all other colors have dispersed in the atmosphere, but it makes about as much sense as him gaining strength from yellow sunlight.
>Magic
Why? There's no reason he should have a weakness to magic.