For instance, I find the observation that a T. rex and an iguana look about the same from above except the iguana has front feet fascinating. If I were to try to share that observation with people, I would be boring. Mr. Rogers is dull. The fact that he's dull on a nationally syndicated television show makes him boring. Boring people talk about themselves.
Dull people talk to themselves and they're very good listeners.
One must make a distinction between the full-time dull person and an exciting person who fakes dullness to relax. Many celebrities fall into this category. Then there are fashion models who are dull people with dull jobs who only think they're exciting. These people are dull-lusional. Dull men are the underpinnings of all activities.