For what it's worth, @steveklabnik's apology was pretty good. I definitely wouldn't describe it as "an insincere non-apology" - he acknowledged the effect he had on the other person, and actually said the words "I am sorry" instead of something passive and weaselly like "I apologise" or "Sorry if...".
http://blog.steveklabnik.com/posts/2013-01-23-node