Sounds like he wants to sell expensive guitars worse than work on guitars. Its up to you to decide the worth of the instrument to you, and likewise the value of any work done to it. If he thinks himself too good to work on a Squier, I darn sure would not bring my Custom Shop to that idiot. Find someone who will do the work you ask for a fair price without degrading you choice of instrument. Those people do exist. They may be harder to find because they don't need to advertise, but they are out there. And usually they have nothing to do with a store.