People have the best knowledge of what they have experienced and to be more aware of what is going on outside their life’s bubble, they have to interact with people who are different from them and to actively search for that information.
Otherwise, they might make themselves oblivious and out of touch with reality, which could make them look stupid in front of others. Ignorance is not bad in itself as it is impossible to know everything, but sometimes it is hard to believe how certain knowledge has not reached a person.