I liked the polite but still interrogative manner he had when talking to Bruce. It wasn't really all that hostile or aggressive; he sounds honestly curious and calm. Bruce gets in some intentional shots, while Clark seems to actually be the bigger man there.
I can't wait for the context of that scene. Cavill so great at emotive acting, and this feels like a lot more to me than just the verbal confrontation. It could be Clark revealing he knows who Bruce is, or it could be him maybe trying to defuse their upcoming confrontation in some way.