That's quite narcissistic and self-absorbed. You're really not that important and to take a letter like this and try to paint it as a "blessing in disguise" is arrogant and foolish.
He doesn't want to work in a Windows shop. He wanted to be able to work with particular technologies. He's a new grad and idealistic. He has preferences and opinions and had the insight to skip working in an environment he believed he wouldn't do well in. He's not a bad hire, just a bad hire for your organization. Get over it.
He bolded a sentence in his email that read "It may seem arbitrary, but the platform an organization uses is indicative to me of a whole lot." BOLDED IT! If that doesn't scream arrogant prick, then I don't know what does. So, yes, not hiring him is a blessing in disguise. I don't want to work with someone who is that arrogant and condescending.
As I said in another reply, I wasn't suggesting that I need a compliment. I was just giving an example of a successful way to respond in order to keep the door open. A compliment won't hurt that, and in reality, it wouldn't hurt to keep the door opened.
What's the point in asking a question and waiting for a meaningless (but diplomatic) response?
I remember long ago interviewing a fellow. I asked him why he wanted to work for my employer. He answered that he wanted someone to pay for his move to Seattle where he could go skiing. People can be astonishingly dumb sometimes.
Yes, and I did and still do many astonishingly dumb things.
Out of curiosity, is the compliment required for you to consider keeping the door open? I'm guessing you didn't mean for it to sound that way, but I'm not quite sure how else it should have sounded...
When my company is hiring, and we lose a candidate like this, I often send emails that are similar, "Sorry to hear you're not accepting our offer. Can I ask why you didn't choose us?" This is actually the potential hire's chance to pay me a compliment, give a small amount of feedback, and keep the door open for the future in case their other "better" option falls through.
I think this blog shows a terribly self absorbed reply. My response to receiving this would be to forward the reply to my team and say, "Glad that didn't work out for us... Blessing in disguise. See below."
Know your audience. Remember, the person you're emailing works there, so you're essentially telling them that their job and work environment sucks when you write something like this.