Class has a sense of humor. It knows that a good laugh is the best lubricant for oiling the machinery of human relations. Class never makes excuses. It takes its lumps and learns from past mistakes. Class knows that good manners are nothing more than a series of small sacrifices and minor inconveniences.
Class bespeaks an aristocracy unrelated to ancestors or money.
Some extremely wealthy people have no class at all, while others who are struggling to make ends meet are loaded with it. Class is real. You can't fake it. Class is comfortable in its own skin. It never puts on airs.