Terrible, this is what I hate about some of the pratts who work in bike shops. If everybody knew how to fix bikes, they would be down the job centre, or sitting watching Jeremy Kyle! By all means, if you want to learn about bike maintenance, do so. But if you go into a bike shop, and encounter 'snooty shop types' I'd suggest putting them in their place, or tell their manager that you find them unhelpful/ intimidating!
And it's not just you. I was chatting to my LBS owner about it, and it's a perennial problem in the industry. Many people who work in the LBS want to do so because they're bike nerds. What they need to be, is good at their job, which is helping people get the bike they want, or get their bike fixed, and doing so politely and helpfully, recognising that it's your custom which pays their wages!
Rant over!