Backseat GM, what do?

Just make it real clear that he's wrong when you reveal stuff. He'll eventually quiet a bit if he knows he might be wrong.

Unless he's a real dumb fucker. Then just talk to him about it.

Or just talk to him about it first.

>>53219999
I've already attempted to talk with him about it. He doesn't seem to grasp that it's a problem, and I think (not 100% certain here) that he views it as helping me with the creative burden by making up shit.

>>53219999
Should probably clarify: force your point across. Make it known that it's a real issue. If he shrugs again then you may want to consider kicking him if he's that much of a dick

>>53220016
Well be straightforward with him and tell him you're really not into it.

Alternative is to play something like FATE or the star wars systems where players are mechanically encouraged to participate in the GMing process, sounds like it would work well with him as a player.

>>53220016
tell him that you appreciate him wanting to help out, but that he can't just drop stuff in in whenever he feels like him. Tell him to give you notes about what he wants to bring in so that you can properly incorporate it into the setting. Then it's up to you if you actually incorporate anything at all

If a player makes an incorrect assumption about information you've given them, you're not obliged to correct them.

Let them continue to believe what they want, just don't treat it as fact. It'll come back to bite them on the arse eventually.

That player could have wasted a lot of time & money trying to help the sheriff rebuild his business, only for him turn around and say he's never touched a hammer in his life and hates dwarves because they're a bunch of shortarsed, bad-tempered, money-grubbing bastards, who would sell you the time of day.

Next time he does it, very politely tell him to stop.
>He does it again
This time you warn him that you'll beat the shit out of him if he does it again
>lol, calm down
>does it again
Get up and kick the ever loving shit out of him. I mean a brutal beat down the likes of which his father never gave him but should have.
I promise you he'll never do it again

>>53220185
you sound like a real badass

>>53219648
I'm not really sure I see the problem. He's making assumptions and stating them as fact. He can talk all he likes, it doesn't make him any less wrong.

>>53220354
This
I mean it would be better if he was making these guesses semi-in-character. maybe you could nudge him towards this, suggesting it's something his character might assume or comment on. but either way I don't see the harm
If nothing else, it means he has interest in what the GM is saying and the world, which seems like a good sign to me. when I hear the phrase "backseat GMing" I think of something akin to rules lawyering, which in my view is much worse

>>53219648
To me, it just sounds like he's making wild speculations unless he's specifically telling you that you should use his suggestions. I mean, if bandits are popping up around town, like magic and I say, "They must be using tunnels!" I'm not expecting the GM to make tunnels. I'm just making a guess.

And I hate to be that guy, but is your stuff that much more compelling than the ideas he's tossing out? Did the sheriff actually have a reason to be that racist or did you leave that out? He doesn't sound shitty enough to be trying to take away your creative control, but if the ideas he's throwing out are better than what you're thinking up, you should think about that and whether you're over-reacting and why.

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It sounds like he's just used to playing the systems that encourage players to create their own "drama" as the game goes on. Believe it or not there ARE systems that encourage such shittery.

Tell him you're the GM, not the Storyteller, and he's playing a character, not setting the scene like it's gonna get him some bennies.