The penultimate boathouse scene with Rocco and Neri
Neri smirking and Michael humiliating Tom with Tom's mistress scoop! However Tom having a mistress would not have sat well with Michael
Tom never learns! Tom keeps giving Michael opportunities for Michael to hurt him
Roth's murder had been sorted Then Tom asks in front of Neri and Rocco
Why did you ask me if something was wrong when I came in?
Tom asked in front of an audience – Rocco and Neri - So Michael had to handle it in front of the audience
So that leaves
Ola's visit scene [Anthony's party] the only [unwarranted!] scene Michael was "harsh" to Tom