I'd note the same author tweeted about being blocked weeks ago by the publisher. So, he's angry that an agent actually made him honour the deal he'd initially agreed (to give higher royalties instead of an advance). And now blames that for the author no longer being his friend.
It's almost like friends don't like being told their writing is worthless and that you descended from on high to make it a success. Who could have known that being terrible to your friends would stop them liking you?
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