i think if the guy can t really hurt your business,then just wait and see if he goes any further with this .
even if we are small businesses full time or part time we should cover ourseleves
like bigger places do , we should always add a small amount (we don t have to tell the customer about it)when we make a price list or give a quote to a customer . an extra 5 $ or 10$ on a 150 dollars job
won t scare the customer away but for us at the end of the year it could cover for those situations .