[JangoSteve]

I agree with the point in general, but for one subtle detail:

What shocked me even more is the amount of comments saying that “supporting IE is too much work”, not because it still costs the crazy amount of time it used to (ie6), but because they’re developing on a Mac.

No, it's not that it's difficult on a Mac. It's that it's difficult on a [not Windows]. Subtle difference, but undermines much of the "grow up" point of the article. You're saying developers are whining because Microsoft doesn't support their operating system of choice. But that's incorrect, they're whining because MS doesn't support anyone's operating system but their own.

And even if it was simply that you can't easily debug IE on a Mac, the fact of the matter is, all the other major browsers allow it. Who cares if it's unreasonable to ask Microsoft to provide us a build for easy use and debugging? Every other vendor (i.e. competitor) does it at the exact same price point: $0. If IE lacks this "feature" at the same price point as the competitors, then I say deciding not to support IE is fair game (though I wouldn't personally exclude IE for anything other than a toy side project).