I like how I managed to set that off by referencing pretty much the only good story in that fandom. For the record, it's praised in large part for being virtually indistinguishable from Martin's own prose.
Also, I lost all respect I might have had for Martin when he turned out to be so rabid about the subject. I understand the desire to protect your ickle creative babbies from the nasty teenaged smut writers, but it's a frankly astonishing display of ignorance about the nature of storytelling. Literally everything is derivative, and some of the oldest and most venerated of the classics functionally are fanfiction, insofar as that they're stories created by people taking characters, settings, and ideas which already existed and shaping them to their own vision.
Yes, it sucks there are literal tons of terrible writers in the world. Yes, it sucks that some of them want to play in your sandbox. Tough shit, that's the price of being part of a highly active creative species.
Oh, and the old excuse about how failing to file takedown notices on explicitly derivative work will somehow void your intellectual property rights? Pure unadulterated horseshit. The closest that we've ever seen to that in living memory is a couple hacks who tried to rip off Rowling with their own "original" stories; those attempts were not only not fanfiction, but did absolutely nothing to her intellectual property rights.
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And, on a more personal note, if anything I wrote was ever successful and popular enough to make people want to play in my sandbox, I'd be fucking ecstatic. Even if a bunch of them were terrible and wrote nothing but cracky smut. Because, at least for me, writing is as much about trying to craft something which other people will take pleasure from as it is my own pleasure with the creative process. But maybe that's just me not being an arrogant, egocentric douche. :|