All tuners dont tune the same exact way and think the way they tune a car is the best of course. If you all tuned the same then it wouldnt matter who went to who and all cars would have the same numbers ect...people are going to go to whomever they want to.
I do belive though that there is always going to be competition for business, especially in the same region. If there is a problem it should be done in private via email, pm, or telephone and not in front of customers or potential customers. This could end up making both sides look bad.