Sol doesn't respect the Corleones at all. He thinks he can muscle his way into the family by killing Vito. He derides Clemenza as "fat," and then when he is suposed to be making nice with Michael one of the first things he does is insult his brother Santino saying "I hope you're not a hothead like your brother....you can't talk business with him." Then at dinner he insults Vito by saying he is old fashioned and not in tune with the times. He is even unrepentent about the assassination attempt....saying "I missed my chance."