I completely disagree. There's nothing gained from making someone feel incompetent when they're just volunteering to better themselves, meet like-minded people and work on something they believe in. You will end up surrounding yourself with equally socially inept people if you encourage this behavior in your community.
Be it doing a better job explaining the project and the requirement/skillset minimums, aptitude tests before they even contribute, or having a pre-defined list of responses to bad code (i.e. '294: Doesn't follow x standard, please see FAQ pg. 84'), there are better ways of handling these situations that encourage people to get better without making them feel worse. Just because bullying people has worked in getting the response that you want doesn't make it the right one.
Be it doing a better job explaining the project and the requirement/skillset minimums, aptitude tests before they even contribute, or having a pre-defined list of responses to bad code (i.e. '294: Doesn't follow x standard, please see FAQ pg. 84'), there are better ways of handling these situations that encourage people to get better without making them feel worse. Just because bullying people has worked in getting the response that you want doesn't make it the right one.