What's about jokes?

If a guy is joking about everything he puts out, he generally thinks life is a joke.  While he may have a fun personality, he sees everything as a joke and usually won't know how to be serious.  Others, like me, are way to serious about almost everything.  I may throw a joke out occasionally but I prefer to be serious.  The other factor for a "joker" is that from what I've seen they generally don't have a very high self-esteem and this results in them trying to cover it up by getting people focused on something else, like as many jokes as possible.