Used before a statement of agreement to indicate that the speaker doesn't particularly approve of foul (or just plain rude) language.
Driver: What the hell's this cocksucker doing here? This is the fast lane and he's driving like my gramps!
Passenger: I don't agree with the language, but you're right.
Reaching an agreement is missing the point.
He shot the guy over a garden hose because they didn't agree about it instead of because he was a real asshole or couldn't be trusted to live and let live. That's not a good reason to shoot somebody.
Though I do agree with your basic premise.
Hym "I just don't agree with how it applies to my situation."