Sorry if misunderstood . I meant the actor who played Geary was delivering it well / good acting. So when the Havana & Senate hearing scene, other people who don't know about what happenned in whorehouse, would feel that there is a kind of respect from Geary. So I use the term "almost sincere", since this kind of (fake) respect is always happenning from time to time. customer & vendor relations, politicians & constituent's, men & parents in law's (at least I feel it ), senators & businessmen etc. And the actor is convincing in delivering this.
I agree with DC that Geary hate on Michael, and he would curse that day when he got set up, how stupid he was not knowing that the whorehouse was owned by Corleones network.