You're very diplomatic.

Unless a company is specifically geared around a toolset that doesn't exist in OS X or *nix (game developers come to mind), institutional, mandatory Windows use seems like a great signal for "shitty company right here!".

Enterprise custom software is probably another area, not that it has to be on windows, just there is a big business opportunity for people to fill on the .NET platform. Not to say thats where you'd really want to work, but some of those shops do very well for themselves.

I think what you mean to say is you didn't intend to say that. Whether or not you actually did say that is another matter entirely. In this case, the majority of your post seems good. But the big bolded sentence that grabs your eye first seems to be implying that there's something wrong with an organization that uses Windows.

I mean, imagine telling someone you don't like their cooking and then saying "The fact that you use margarine instead of butter says a lot." You're not directly saying anything bad about them personally, but most likely they're going to take it as a roundabout way of saying "Real cooks use butter, but you use margarine. Therefore, you're not a real cook."

"But the big bolded sentence that grabs your eye first seems to be implying that there's something wrong with an organization that uses Windows."

So what if he did? By the time you've reached that point you really ought to have figured out the entire post is a subjective opinion.

Here, I'll say it too: I don't want to work for an organization that primarily runs Windows by default. I don't have to justify it rigorously scientifically. Nor am I saying there are no skilled Windows developers in the world. In fact my company has quite a few in it ("some of my best friends are Windows developers", ahem). Nevertheless, I do not want to work for a primarily Windows company. I do not like Windows software culture.

> I don't want to work for an organization that primarily runs Windows by default.

That's when you say "I'm not a Windows guy" and leave it at that.

He can say what he wants, is the thing. When you reply to a "why didn't you take the job with us?" feedback request, you can be as succinct/diplomatic as you think is appropriate. The OP did the same.