You must be really stupid then, because you have UNDERperformed the market.Why should I ask my broker that? In six years I have quadrupled my wealth with his advice!!!
You should ask your salesman to what extent he has been influenced by Markowitz to learn that your salesman is just that without any training in Finance and investments.
Someone in the investment field who is unfamiliar with Markowitz (whether or not they agree with his work) is equivalent to one saying she is a quantum physicist but unfamiliar with the work of Niels Bohr.