It seems childishly wasteful to turn away potential contributors because you simply feel you have the right to be an asshole to people. Personally, if you want to treat me harshly for my work, I expect some good money.
* Paraphrased reaction to software a classmate sent in after completing her thesis
In contrast, there was another project where my student and I noticed a bug in a piece of software and patched it. It was quickly accepted and we moved on. I would be happy to contribute to that project again.
It's all about barriers to entry. If a project wants outside contributors, those barriers need to be low. Of course, the project creators/maintainers are also doing this in their free time, so have the right to do what they want, but they should expect less community contributions if they make those barriers high...
Citation?
A raw assertion is not helpful.
People, especially younger generation can't stand being treated harshly. You can't criticize them, and every response must be nice, politically correct and helpful.
Sometimes you just have to let it go, or simply fight back. And when you do fight back, be prepared because it's unlikely that you will win every time.. Such is life. Grow a pair.
When I was younger it was normal for kids to fight in school. Nobody really cared if you got your ass kicked once in a while. And often times you kicked some ass. This helped people realize that not everyone in their life will be nice and helpful, and that sometimes you need to have a thick skin and ignore what people are saying. Now it seems kids, when they get laugh at or in some one offended, if they can't get help from the adult they just grab a gun or a knife and start killing people because they simply never had a chance to learn how to deal with competition.