If I don't want interaction, I'll often leave the backstory very empty.
I tend to get annoyed when the DM fills it in because that's not an area I want to focus as a player.
Agreed. Like I said, as a player I'm seldom very interested in my character's back story - I'm interested in where I'm going, not where I've been - but anything that is there, I want it to be there because I put it there. If the DM needs me to have a sibling or a parent for plot reasons or whatever, the DM should ask me and I'll come up with something.
I'm an old-fashioned, territorial gamer. The way I see it, certain things are player territory (the PC's character concept, background, and non-magically-dominated decisions) and others are DM territory (the game world). You can ask somebody to put something in their territory for you, but you don't get to just walk in and do it.
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