Given his feminist cred, I wonder if Neil Gaiman remarking that
"George R. R. Martin is not your bitch" can be read not as a
misogynist slip, but a use of the culture's current popular metaphor for exploitation and abuse. In which case, the insult is not directed at the targets of abuse, but at the abusers, with the sense of "stop treating other people like your personal property". It's not a metaphor I'd use myself, and it's right to point out its ugly connotations. But just how useful is it to pillory a long-standing feminist ally on the basis of a single remark? How about (and has this expression has ever been more apposite?) playing the ball instead of the man?