Motivated by conversation analytic claims on preference structure, this paper addresses the question of whether there is a difference in the preference structure of confrontational and non-confrontational conversation by looking at the turn-shape of reactions in adjacency pairs. Two complementary experiments were carried out in order to specifically test whether oh-prefacing agreements and disagreements as reacting turns to statements had an effect on how aggressive the turns were perceived to be. The results suggest that oh-prefaced disagreements were less aggressive as compared to plain disagreements, but oh-prefaced agreements were neither more nor less aggressive than plain agreements. This paper contributes evidence that there is a preference for agreement in non-confrontational conversation but no such preference holds in confrontational conversation. Since these two conversation types are distinguished by whether the interlocutors adhere to politeness or not, I propose that preference structure varies depending on this condition.