He's probably had no competition until now. If he's doing a good job for a fair price, and his customers are happy with him, he won't have a problem. Ones with attitudes such as his, however, often means they feel threatened as they have had the monopoly over 'quality' (as in poor) as well as quantity. Keep smiling, do a better job than him, then his customers, one by one, will find their way to you.
John