The point that Winer was making was that Kottke once stood up for him (Winer) in the face of bullies, and here, he seems to be joining in the bullying instead.

The point that Winer was making was that Kottke once stood up for him (Winer) in the face of bullies, and here, he seems to be joining in the bullying instead. I suppose Gruber is just a small, mean-spirited bully of whom Winer has no special expectations.