Why is it okay to put hot stuff in/on aluminum foil, but it doesn’t like being in a microwave?
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Because microwaves aren’t just heat. They work by shooting high power radio-waves that are tuned to heat up water into your food, which heats up the water in it, and that water then heats up everything else.
We don’t want metals in microwaves because that first step of shooting high powered radio waves can cause metals to have electric currents to flow. That can both heat them up way hotter than food usually is, and it can cause them to ignite and make a plasma in your microwave, which is bad.
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