Fungi were consider plants (if macroscopic) or protists (otherwise) until the late eighties, so as a rule only young people know that mushrooms aren't vegetables. And anyway, the Darwinian classification scheme is not really relevant for the purposes of determining diet, unless your reason for not eating meat is because it's from the same Kingdom in the scientific nomenclature as yourself, which seems... unlikely to be a very common reason.
Sanity? Oh, yeah, I've got all kinds of sanity. In fact, I've developed whole new kinds of sanity. You can just call me "Mister Sanity". Why, I've got so much sanity it's driving me crazy.