Porcelain usually isn’t glazed and is made from a finer particulate clay allowing it to be smooth and non porous on its own. It’s the cheaper ceramics that rely on the glaze to be water proof that are prone to this problem.
If your dishes aren’t getting unusually hot in the microwave then they’re fine.
Not enough people (including you) don’t know that “Nazi” is an abbreviation for “national socialist”.
This meme is about telling Nazis we’re not interested in their BS.