@evan Eugen and Mike Masnick going at it was just one example in a long line of things going back over a few months. You've had statements too that were inflammatory towards the AT Protocol community, and they've had statements that were inflammatory to AP.
The letter did not explicitly call out any of these, as to not relitigate them or point fingers. I deliberately wrote the statement to try to avoid pointing fingers or giving fuel to any arguments, that's why if you don't know you might think it's vague.
Lauren's has been doing a great job covering all the different things happening in the community; subscribing to his newsletter will definitely make you more informed if you aren't already subscribed.