The customer is always right…
The customer is always right. Well, no, the customer is not ALWAYS right but the customer is the one that provides the money and that is close to being always right so if the customer decides that the contractors vehicle (or shoes or clothes or attitude or politics or stupid red cap) is offensive they have the right to withhold their money. Pretty simple really. Maybe this guy simply needs to go looking for like-minded people to do business with?