Please comprehend the power differential.
On one hand we have Hazou, an injured Chuunin who has stats on par with a gennin at the moment because of it.
On the other hand we have one of the strongest S rankers in the world.
Hatred of him would be... impotent, to say the least. We (and Hazou) are suppressing it because there is absolutely nothing we can do about it.
Have you considered that Itachi expects to be hated and maybe expressing it a little might actually buy more credibility in this situation, not less? I'm not saying pitch a screaming fit, but right now Itachi either thinks Hazou is either being dishonest or worse is being honest.