Creativity and innovation always builds on the past. The past always tries to control the creativity that builds upon it. Free societies enable the future by limiting this power of the past. Ours is less and less a free society.
Humor is so culturally based that when I try to tell a joke as me being a white American, if I tell other white Americans, they'll laugh. If I tell an African American, they might not laugh. In fact, they either might not find it funny, or they might find it offensive, and I didn't mean it to be offensive. So these are the sort of little things that build up over time, just like in a marriage. You know, the little things can build up over time.