We have to realize some of the utopian, perhaps unrealistic or futuristic ideas about human behavior that trek was pushing at the time.
Humans don't get bothered by being called names, they don't grieve, they don't want things, they don't settle disputes with their fists, they don't fear death, they don't judge attractiveness by physical appearance, they don't bother with on screen entertainment anymore (TV), ect.
They would probably say there are no drug addicts in the 23-24th century.
These are some really nice things to think about, but are they saying all of earth is like this? No human whatsoever can be bothered by an insult?