In Act 2 Scene 3, Can you comment on the contrast in manners and breeding in Cassio in Iago.

Cassio’s comments about his own drinking, along with Othello’s warning to Cassio at the scene’s opening, show that -Cassio is predisposed to licentiousness, and Iago, always skillful at manipulating human frailties, capitalizes on Cassio’s tendency to get himself into trouble in situations involving pleasures of the flesh. Further evidence of Iago’s skill as a manipulator is his ability to make Roderigo virtually invisible in the scene. Once Cassio has chased him across the stage and stabbed Montano, no one gives a second thought to the man who may or may not have begun the fight. No one seems to have any idea who Roderigo is (even though he is always onstage, even in the court scene of Act I, scene iii), and Cassio cannot even remember what they -quarreled about.