<sarcasm>
I am so terribly sorry that my spelling error offended you so greatly that you felt the need to take the time to write a special post just to correct me. In the future I will try to live up to your expectations with respect to my spelling habits. I'm terribly sorry I let you down so horribly. I will do my best never to spell wrong again.
</sarcasm>

Why would telling me I used a word ending incorrectly upset me? It does no harm to me, in fact it helps me, because now I'll never make that mistake again. So if your way of "spiting" me was to actually inform me that I was using a word correctly, then well done!