If you can't find another shop where they treat you better, then try killing them with kindness. I once had a patient who would sit and glare at me while I tried to help her. I made it a point to call her by name every time she came in. About every other time I saw her I would say something nice, along the line of "I love your shirt, where did you get that?" It took several times of me ignoring her glares and killing her with kindness, but she stopped glaring, started speaking nicely to me, and then before she moved, she came in to my work and gave me a goodbye hug! It's worth a try if there is no other shops around. I agree with the taking a class idea. It's a good chance to meet people. Have your wife take a good book and go along if it makes them more comfortable. Eventually you will win them over.