It's true that some members can be high and mighty, and short, abrupt and downright rude responses would I imagine put a newcomer off. It's a shame when those new members don't realise that post-count doesn't necessarily equate to knowledge and experience, or even a helpful attitude. But if they hung around for long enough they'd be able to recognise the good guys (who are by far the majority) and disregard the others.
I belong to several bike forums, but this is by far the most addictive. We should all be very proud of what we have here. A vast library of knowledge, and genuine experienced folk always willing to help out if they can. It is, I believe, on the whole an extremely welcoming community. I am embarrassed when new members are treated with sarcasm and contempt, fortunately it doesn't happen often. With a membership this large, you're bound to get the odd prick now and then.