I would also add that buying a bitcoin is not exactly a straight forwarding thing to do since usually you have to open an account on an exchange, send the documents, wait to be verified, transfer the money and then decide where to store them. Many times when you explain to people all these steps, a lot of them immediately think it's too much effort.
Then try providing them with the other methods of purchasing bitcoins. You don't have to use exchanges. If you're giving people the impression exchanges were the only option, then you're not explaining it correctly.