I thought this post particularly summed up the limits of allowability and where and when the Giant is speaking out against. Then again, just because I found someone arguing that Sabine would completely cease to care about Nale (as she never really did being a succubus) the moment he bit the dust, and the Celia wasn't capable of lasting emotional connection either (being a personification of wind) doesn't mean that there was any suggestion to that effect in the comic, ever.
http://www.giantitp.com/forums/showp...9&postcount=98
It says clearly that he does not have a problem with other portrayals of, say demons, but that he himself gives them human responses. Also he is specifically addressing D&D and how it's played, though I'm unclear to the extent that what he says is meant to or includes all sci-fi & fantasy literature. With the exception of some clear statements "if a fictional human kills a fictional dragon for no reason..."