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I'd expect them to tell you why, first.

If you’ve ever taken a philosophy class, you’ve probably seen these two types at play against each other. The INTP is that smug jackass that automatically takes the contradictory position then argues, not for the sake of their position, but to tear apart everyone else’s ideas by nitpicking verbal inconsistencies and confusing their opponents by manipulating logical gaps and re-contextualizing arguments to highlight unintended implications. The INTJ is the one that picks up the debate right when everyone else in the class is giving up and fights hard to logic the INTP into conceding their point. The INTJ gets frustrated that the INTP won’t stay on point, and those emotions lead them to make more errors for the INTP to exploit. The INTP is entertained by watching how everyone spins out over the course of the debate.
Okay, so that example had a little INTJ bias. I was a philosophy minor; I have battle scars. There are areas in which INTJs have the advantage over INTPs, but arguments are not one of them.