What not to put in a microwave?

So I ask my brother if porcelain is okay in the microwave. He says of course, says something about lava, and I proceed to stick Mom's porcelain plates into the microwave with my breakfast at 12pm. Apparently these plates must not be porcelain or that platinum lining is some cause for concern because they got extremely hot when I attempted to take the plate out of the microwave 20 seconds later. I now have a nice burn on my thumb and know not to trust my brother when it comes to microwaving. Proceed to tell the brother that if I hear his dorm room has burned down, I'll know why.

I did look up porcelain and microwaving afterwards. Supposedly it's safe unless the porcelain has gold or silver lining. What about platinum?

My thumb is still burning so it's hard to type. (I have a low pain threshold apparently)

still sick. does anyone know how to make a bad phlegm-y cough go away? and my stomach keeps rejecting food. -_-