Do you remember what Locke's foavorite thing to say last season was? "Don't tell me what I can and can not do!" Mr. Oz's little barb was like saying to Locke "You are not in control and, Jack is. You are just Jacks faithful puppet and he pulls the strings. Yes that's going to tick him off.
I think that is exactly what he wanted to do. create a riff and turn them on each other.

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Hope is a very dangerous thing to lose. - Sayid

I do what my Rice Krispies tell me to. - Anonymous