I think it's important to always delve into the unknown. Find something new about the world or just about yourself. Explore new things/interests everyday and you're bound to learn and grow as a person.
I've found that when "dumb" is used against someone/something, it is usually only a response against something someone has judged too soon. You don't usually hear "dumb" being used in an articulated, well thought out argument. Don't judge something you don't fully understand, it might be much more than you would ever know.