Well, he isn't anyone's boss here. I agree, and so would linus nowadays, that this is toxic and should be avoided, but the anger I fully understand.

Attempting to shift blame away from yourself after making a change which breaks a large portion of user space is cause for termination at any company I've worked at. It's cowardice. This action goes against one of the most important, core philosophies, of the kernal. Do not break userspace. Also, this person should know better. They are not some odd newbie who may not grasp the ideas yet.

In a world where termination is not an option harsh criticism is required. This though, I agree, was anger driven unprofessionalism