Good service, deeply strange service provider

I cannot fault the service - professional and thorough, and I wanted to use his services for a third time in four years. However, Gus is a strange person, and refused to do business. We had minor cash flow issues and waited for payment from the contractors who had damaged the pool, and therefore paid him slightly late (still less than a week after the service was rendered). Payment was then made in full. At the time I explained what happened, and he was not impressed. Still, I was astonished that he turned down our business, "because I do not do business with people who hold money back". I really do not take kindly to people who insinuate that I am dishonest when I was simply being open.