An easy way to make enemies

The administrator for one of the mailing lists I'm subscribed to has had a recurring problem:

Hi folks,

If you are an AOL user, and want to get off the list, I would appreciate it if you would do one of the following: either

(a) use the instructions that were mailed to you when you subscribed to the list,

(b) go to [list subscription management site] and use the links there, or

(c) ask someone for help.

Please do _NOT_ mark the list email as spam, as you run the risk of killing our AOL whitelisting and thus affecting our ability to get mail to other list members (not to mention some of my clients) who use AOL.

It hadn't honestly occurred to me that some people were not only so lazy, but so thoughtless as to do something like this. I can understand the decision to leave a mailing list, but to do so in a way that actively harms both the list and a potentially high number of subscribers? That's low.