Two things bother me about Sasuke's comments: 1) although informing Sakura and Kakashi may have been pointless in Sasuke's eyes, so would have making the comments that he did. It did absolutely nothing to benefit him nor the situation.
2) In the amount of time he had to sit there and listen to their retorts, he could have been done explaining the situation to them.
To me it seemed pointless to for him to point those things out outside of making himself feel superior. It would have probably been more efficient to state the situation rather than make a statement that invoked an argument and ultimately demoralized the little help he had.
Sasuke may be intelligent, but he had a dumb moment right there.
On a side note: wasn't his whole plan to sit and wait out the effects of IT?