Name-calling never got anyone anywhere.
Don't confuse name-calling with "nick-naming". Nick names are descriptive terms for friends and enemies, terms like "Rocket Man", "W" AKA "the Shrub", "President Hair Do", and "Slick Willy". But, name-calling isn't objective, can't be endearing, and only serves to vent frustration from people who can't bring the change they want.
Don't call people "moron", "brain-damaged", "stupid", or "buffoon". Don't imply it. Don't talk like it. In fact, say so when other people do.
Calling names is one's own surrender. It's the loser throwing rocks at the tanks entering his city. Don't ever be that guy.