That broadway story made me laugh. As a professional actor you see bloody hissy fits all the time from never-were's let alone has beens. And if the assistant is crying because of what he said, she needs to grow some chops because I've had far worse things said to me by people when I've not only been in the right, but also totally conciliatory. If it wasn't him and didn't fit his persona, it wouldn't be a story.
As for the broader issue, the sports world is full of people who didn't last because they didn't have the mindset to make the incredible sacrifices necessary to be a top level pro sportsperson, as much in terms of personality as lifestyle choices (due to the tedium of the dullness of many extremely professional but charisma-less teammates), and Avery is one of them. He played up to his panto villain too far, and pissed off the wrong people because he had the dangerous element of intelligence and imagination, but not nearly as much as he thinks. He always knew his role, but never knew the line, which is why things got tricky for him. That said, I've no doubt that his bad behaviour was blown out of proportion because he pissed off the wrong people, and things got into the public domain that would have been kept quiet had they been the actions of others.
The article is well written, articulate and thoughtful, but also demonstrates a characteristic lack of personal accountability for his mistakes.