Maybe if people would learn to Google the question first...
There's a study in human behavior that says that we essentially poke fun and deride things to encourage certain behaviors among our peers. We make fun of people with tramp stamps, people who don't want to be associated with the connotations of having them won't get them. We make fun of certain accents and some people work to disassociate themselves from it by working to eliminate the accent (I know a few people that have done that with certain local accents in the region where I live).
In other words we encourage certain behaviors by reinforcing what we want to reward, and humiliating people who act against the grain. Jeff has pointed out the opposite facet in this by saying that the sites are engineered to encourage good behavior using badges and reputation as motivators, and discourage behaviors by taking away reputation and allowing the community to work to bury people's questions that shouldn't be there.
Most sysadmins/techies seem to have a strong intellectual streak with a leaning towards having people work to solve questions on their own that are very simple to find the answer to on their own. They also tend to be arrogant in their own domain of knowledge, and often grow tired of having to answer the same questions and issues at work with their users after having answered the same questions over and over and over and over...sometimes with the same people asking them a month later the same question.
In a community comprised of people that have to deal with this and are answering questions here as a way to share what they have experienced and look for an intellectual challenge, why wouldn't they snark at people who couldn't have been bothered to Google for an answer that is already out there? There are people who are already getting miffed at the homeworkers asking for dolts to hand over their CS homework answers for them.
New people need to fit into the community. If they don't like it they can participate to change it by getting reputation and participating in upvote/downvote. Otherwise the community that is entrenched probably doesn't want to suffer what they see as their bad habits and unwillingness to invest a little research time on their own...we get enough that at our day jobs and we're not paid to do that with the Atwood Trilogy Sites :-)