I really can't think of a better way to respond to this situation. It is clear to me that over the next decade the amount of people who will have been hot-headed kids on the internet who grow up to fully-fledged adults who have said they no longer agree with things in ways that are not kind is going to be a lot higher. I've no doubt said things that I no longer agreed with that made sense in the context of when they were posted.

Thank you for being a good role model and setting the example that saying "that was bad, here is the context, but I don't like that I said that."