Most times is lacking of proper orientation or lecturing, this sets of people can never want to bring out their time to read information on what they are investing on rather than just focusing on profits aspect. However did even know what he is investing on?
Are you sure he fully accept the risk that follows bitcoin because some people may not know how volatile the market is.
If your friend calls you again, tell him to follow his mind otherwise if the price drop below his expectations you may become his worst enemy.