Cavil gets under Saitou's skin, no matter if he'll never say it aloud. And there's that big control fight going on constantly over which one has the upper hand. But he's going to do his damnedest not to show any sort of sign that Cavil's words can bother him - thus the cocky attitude almost 24/7.
fff idk you know how Saitou feels about Cavil XD;