Although weirdly he only apologized for the single incident Matthew described in detail, even though Matthew explained that it was just one example from years of bad behavior.

HN discussion about response: https://news.ycombinator.com/item?id=27544797 although very low quality comments so far.

https://lobste.rs/s/6rnyn9/why_i_no_longer_contribute_racket has some good quality discussion on this topic.