This is SO TRUE - You really don't understand it fully until it happens to you. "There are some people who could hear you speak a thousand words and still not understand you. And there are others who will understand without you even speaking a word.
Red Flag You find yourself explaining the basic elements of human respect to a full-grown man/woman. Normal people understand the fundamental concepts of honesty and kindness. No adult should need to be told how they are making other people feel.