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"Here are our coding guidelines. If you don't like them, the door is over there."

Yes, but what happens when the person in question wrote the guidelines and that's his attitude. Depressingly this is something that happens.

Then it's you who takes said door and starts looking for a more sane place to work at

That doesn't work when you're handed a team of lazy idiots.

Or even someone who is fast and/or good. He just goes and does it whatever way he wants, then because it's done it just stays that way forever.