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So, it seems like your real problem is that the tacit agreement you all had has stopped working.
Step one: figure out what they were, and write down all of the ways in which your groups house rules differ from the written rules.
Step two: announce the problem. Let everyone know that having everyone use slightly different rule sets is causing friction. Let everyone know that consensus is best, and this would really help, even if not everyone gets their way on everything.
Step three: talk it out. Discuss each change as a group, and make some decisions.
You'll invest a whole session on this, but it's worth it.
Hey there. While this is good and well-intended, I wanted to add that following the "write down everything" guidelines too far can cause a worse issue when in this case what is important is the spirit of the game. Your "spirit of the game" isn't to pin down everything and interpret it to the nth degree no matter what.
Discuss as the poster said, yet focus more on outlining your house rules in general, then follow with a conversation about how to interpret rules in the future (RAI versus RAW, etc.). It will likely require more than one conversation before he "gets" it. However, and this is important: ensure that the player knows he will not be screwed over. ...and that you encourage discussion, but that railroading the game into a rules argument that takes over an entire session is not just bad behavior, it's unwelcome at the table.
How you respond should be within the spirit and intent of how you intend to play.
Just be sure he isn't punished for not knowing...and that he understands your group's expectation of behaviour at the table.
I would probably also set a limit to how objections are handled, as well as lawyering. That is, it may be brought up once in session and must be brought up politely. Details are reviewed after session whenever possible, and if the DM says no, accept it and move on, or find another table.