Or when a "non-hacker" is looking for someone to help out or a hacker who doesn't know a particular technical aspect looks for help, the lashing is severe. There's a difference between constructive criticism, designed to challenge but inspire the recipient, and just being a jerk who gets off trying to look the bigshot by making others feel like losers for sharing private aspects of their personal entrepreneurial struggles.
We all have more in common than differences; for example we're all surrounded by cubicle drones in this life who secretly rejoice at the prospect of us failing miserably because they're too scared to try going out on their own to do their things ... shouldn't we generally be supporting each other and keeping our morales up as much as possible?
If you don't like someone's idea and genuinely think it should be improved, say so. But what good does it do anyone to tell them, "wow your idea sucks ... it's the stupidest idea of all stupid ideas ever!"