I think it's because his indignant demand of the Cygwin team to fix this "bug" and make it work for him. Basically it's the attitude that I know my way is the right way, now fix the platform so that my program runs.
He questions whether it "should be fixed" in Cygwin, a perfectly reasonable request, and he fully admits that he isn't sure whether it's a problem in Cygwin or not.
"Should be fixed" is a passive aggressive way to demand it to be fixed.
His reference to Linus doing the same thing in kernel (not) sounds very much like a smack response.
Also he claims he knows what he's doing since he has done the same thing in DOS so when it's clear that he has no clue of what's going on just irrates people.
Instead of trying to walk "indignant demand" back to "passive aggressive way to demand" inch by inch, just concede that all the guy did was ask a question and make a case for why he thought Cygwin's behavior was broken. Nobody's saying Cygwin has to agree with him, but you've simply mischaracterized the start of the thread.
My interpretation is that Korn was trying to be funny (and he succeeded), but as usual the peanut gallery ruined the joke.
