This is pretty comon in a lot of specialty stores. I've run into other places with similar attitudes. Wherever there is a high-end hobby that requires extensive knowledge you get these guys in business. You have people who are the only game in town and know it. They look down their noses at their customers, who they feel aren't as knowledgable as they are. They probably got into the business because they enjoy the activity they represent, but don't have the people skils to do it right.
I've run into it with homebrew shops, SCUBA stores, high-end bike shops, and boating stores. It really is aggrevating.
There is an very good store in Buffalo, NY. They have a decent selection. The prices are a little high, but not crazy-high.
There is a young guy who runs it. He's very knowledgable and helpful. When he's not there it's kind of a crap-shoot.
I buy specialty grain there a lot. I generally get equipment online because it's way cheaper.