If you still think that is awkward, how about this. One of my acceptance notification was sent in batch with no BCC. A week later, someone sent a mass mail to everyone EXCEPT for the graduate program coordinator asking if we have news on funding details (and he did get a reply!). Frankly speaking, I was slightly annoyed (it was far from a friendly introduction email), but I have already trashed that email and I couldn't even recall his name for god's sake.
If someone's really annoyed by your one email and be mean to you for six years, I'd say the fault lies with that person and not you.