I was raised with a modicum of manners. When George Washington was a young man he wrote a book of manners. They were very important in his day.
The meaning of manners is simple: Doing what makes others feel comfortable. I have no need to call attention to myself, like a 4 year old, by spouting racial slurs, using profanity in public or calling women by degrading nasty names such as John McWar did.