I've experienced a form of hostility in StackOverflow just recently--as in a couple of days ago. On a whim, I visited the website and answered a couple questions, something I'd never done before. I realized it was actually a lot of fun, so I started rapidly answering the all JavaScript questions I could as they were asked. Suddenly a "higher ranking" individual started leaving comments on my answers that I needed to…
Some questions are clearly daft, the person hasn't done any prior research, the question is vague, the problem is not apparent and it's a big waste of time trying to help. These questions are often shut down mercilessly and I think that's probably the best thing for them, but I've no doubt it's a terrible experience for the guy asking the question. I think the SO blog post addressed it pretty well by outlining a more streamlined question form with clear prompts for each part of the question.
Other questions are not daft, but perhaps are not asked well. They need to be edited, re-framed, boiled down to the essential parts, an example included, the expected output included, that sort of thing. It's tiresome to run into questions like this over and over, and I can understand how people might comment out of frustration, but it's good to prompt the OP to fix their question up so it can (and probably will) be answered well. Kid gloves and kindness are important here, it's not always easy to ask a good question. The SO blog post went a long way to addressing this and I look forward to seeing some changes on the site.
Overall I think SO is a fantastic resource with many amazing contributors, so it's good to see them responding to this problem and I hope they can make it even better.