Let me ask you this: do you use Facebook? Because Zuckerburg doesn't just call "bad people" (scammers, thiefs) names, he calls the users of his own site "dumb fucks". [1]
There are greater injustices happening elsewhere in the world right now, save your indignation and outrage for them.
> "That client thinks I can do X, Y, and Z and not completely fuck it up. What an absolute idiot."
To the extent that I am learned about Zuckerburg in his earlier days of Facebook by having read various biographical accounts, I can pretty confidently say that the seriousness of his offer and the seriousness in his calling Facebook users "dumb fucks" goes well with the rest of his persona and doings.
But anyway, this is getting pretty off-topic so I'm stopping here.
2. My feedback, like much that I've give here in the past 6 years, was sincere. I hate to see a promising business shooting itself in the foot like this.
3. There's not much more "ignorant" that calling constructive feedback from a potential customer "ignorant".
4. If you're going to insult others here, the least you can do is identify yourself in your profile. Comments from anonymous posters like yours send contributors like me away and drive this site further into the toilet.
5. Don't say "Meh".