One of my rules of thumb for judging a bike shop is the first question the sales person asks (Can I help you? doesn't count)

If the first question is something along the lines of "How much do you have/want to spend?" the red flags go up.

If the first question is about getting to know you, I feel much better about the shop. "How long have you been riding?", "What kind of riding do you like/want to do?", "What are you looking for in a bike?", "What are you riding now? What do you like/not like about it?" etc.

Being an older clyde, it's fun to go into a new bike shop and feign being a total newbie. It tells me a lot about a shop when I see what they try to sell me.