tptacek is a supporter of Obama's program of extra judicial drone executions, so it goes without saying that he dislikes Glenn Greenwald. Additionally, he feels he can make attacks on the tone and minor details of Greenwald's reporting so he comments on that, but does not comment on this story for example: https://news.ycombinator.com/item?id=5844972 where it's more difficult to discredit the messenger.