It is not about asking too much, it is about the tone and the manner of his response. And the fact that he did this over his employers name, Red Hat. He has apologized, and I accept his apology, but it should not have happened in the first place. Why not ask the powers that be to put a label on the URL indicating that that is where you go to manage your subscription, including to unsubscribe.
Lets look at the bottom of every email sent to the list.
Well, I'll be damned. I wonder what it has on it. From which you can unsubscribe. Inc. All rights reserved.