I'm mostly with Shinta on this one. Though it's kinda unclear what happened in between seeing as both Satoshi and Ibara knew he was working on it after they rejected all those theories. I can't really see Oreki not telling them his conclusion if they asked about it then again I can't really imagine them not asking what his conclusion was either unless they didn't want to call him just for that.
In short my problem with their attitude can be summed up in:
- Solve this for us Oreki, we don't care that you're not interested
- You solved it, let's see... the ending was interesting and surprising. But you're wrong that's not the real ending
It just doesn't feel warranted to me.
While I'm at it another reason I didn't like their attitude when they told him the flaws in his theory is simply, they haven't ever shown to care about what Oreki wants nor his opinion despite all the things they force him to take on.
But I did love the scene with Oreki and Chitanda at the end because it made it seem like things were somewhat strained between the two and it looked like Chitanda understood that she's a big part of the reason since she forces these issues on him. I guess it's also interesting how she didn't want Hongou to end up in the same position as her uncle being unable to scream yet she inadvertently got Oreki into a similar position instead. Though that's just how I viewed that scene, it made me feel quite sorry for him. I'm going to be disappointed if everything goes on like normal considering how much they tore him down.
As for the Empress I'd say some fault lies with Oreki, he was after all informed of Irisu's ability to turn the people around her into her pawns and that's why she got the nickname Empress. Had he remembered it then there probably would have been less of a chance for her to trick him. But really the biggest reason for not liking her would be the line at the end that the reason she did all of it was because she found the story to be boring. So it seems she did it for a personal reason and nothing else. Oreki got torn apart just for that, because she thought the story was boring.