He really couldn't care less what Tony was thinking. The man was from a different time and one that wasn't particularly noted for its friendliness towards people. Rush, rush, rush and no time to just do someone a kindness.

"Would you like to come in? I can only offer you water but we shouldn't stand in the hall." On top of being rude, it was also dangerous around here. Isaac looked like he could use some time to cool down.