I haven’t actually used harsh language with anyone so I’m not sure what your point is. I have been on HN long enough to know that expressions of strong negative emotion are punished here. That says absolutely nothing about the effectiveness of different methods of influence within an organization.
I think if people are rallying to defend GitHub due to some language that ruffled their feathers and not objective technical merit then they have completely lost the plot as engineers.
As far as Andrew’s goals, I think he has been pretty successful within the framework of the attention economy.