If he's so fanatical about copyright, why can't he post something about it?
The culture developers are used to on github is forking people's work and tweaking it (while still giving attribution to the author). It's not totally shocking that someone would accidentally apply this philosophy to this book. Telling someone he has "no class" for doing this is just being a dick.
But then again, its Zed D Shaw. He earned that middle name.