Brother, I think the reason why knowing our culture may not be important to most of us is because we don't see how knowing the culture helps us to meet our basic needs. For ex. many Blacks are concerned with feeding, sheltering, protecting, educating themselves and their children, and many adults are struggling to get and keep jobs, finding a mate, and such, so how can knowing our culture help people in a practical way to meet these needs? Most of us are operating at a subsistence level and in survival mode 24/7.
It's similar to a question you asked the other day about what is ATR doing to help the community. When a community is not able to meet its basic needs: food, safety, love, belonging etc. most people are not going to be concerned about things like "knowing our culture," which is a higher level need. Are you familiar with Maslow's hierarchy of needs? It has always helped me to understand why some people prioritize or don't prioritize the way they do.
http://en.wikipedia.org/wiki/Maslow's_hierarchy_of_needs
As long as so many of us are focused on meeting our basic needs, it's almost guaranteed that the vast majority of us won't care about knowing "culture."