DEAR MISS MANNERS: A friend of my parents likes to “teach” people, of all ages, new words. After someone has said something, she will introduce a word that she thinks they could have used: “So, your brother wanted to aggrandize the situation, did he? Aggrandize it?” “You don’t think her excuse had a modicum of truth? Not a modicum?” Some people might find this acceptable if a child is being taught, but she will do this to adults in their 70s — who are 10 to 15 years older than her. GENTLE READER: Perhaps you can come to their defense by saying, “Great Aunt Twyla, you choose your words so meti…