Not something that offended me, but it does continue from being shy and not terribly sociable at my last job. There were some emails being forwarded between me, another reporter at my office (who I actually got along with), and a reporter at one of our sister papers where all of the production was consolidated. I occasionally went down there to supervise the final pagination of our paper, and really got along with people there much better in fact. But I still took a little while to warm up and join in.
Anyway, the reporter from there emails the person at my office (continuing this long string of forwards and replies), and at the end of the message happens to mention "What's with Andy? I try to be friendly and he doesn't respond. Weird." Fair enough, except that she accidentally clicked "reply all" and sent a copy to me. Oops.
So I answered her question. Told her I'm a very introverted person by nature, and have what might be called a mild social phobia. It doesn't affect professional interaction with people, but small talk and casual greetings don't really come naturally to me, but I will be sure to say hi next time." To be honest I can be so preoccupied at times, especially with a busy day ahead, she might have spoken to me and I just didn`t notice.
I wasn't mad or embarrassed or anything. I know I can seem unfriendly, and I'd rather have the chance to explain something like that. Besides, she was the one who would s**t herself when she got a reply back from me.
And sure enough, I got an immediate response with that panicky "Oh God, I'm so sorry!" beginning. I was sure to always say hello to her after that.