A day in the life of a gunsmith

This  one stems from one individual who brought me his AR10  that he had "custom build". He brings in his gun for a cleaning and scope alignment.  A few days later I  get this  email saying how horrible I am because he could not hit his target at  like 600 yards. He  did not like it when I dare question him and ask if he checked his  zero. After several more emails of him telling me how awesome of a  shooter he is. He was invited to  never return. Just another day in the life