People will also tell you that peanuts, almonds, pistachios, cashews, horse chestnuts and pine nuts are not nuts. But from a culinary standpoint that is obviously nuts.

Strawberries are not berries, Pluto is not a planet, Watermelons are not melons blah blah blah. "Expert" classification systems that defy the commonly accepted usage of those words are, in my opinion, stupid and useless unless you are an expert working in the field. It's pedantic and silly to try to bring such technical jargon into a nonscientific discussion. /rant