My take, for what it is worth!

Desert Inn scene –

Rocco exits the room, joins two men [who were they?] and the three of them are conversing

Neri does not seem to even look in the direction of Rocco and the two men

1. Neri seems to hesitate as if unsure whether Michael meant just Rocco only, surely not both of them!
2. Then takes a couple of steps towards the coffee table, grabs a cigarette and exits
3. Neri does seem to stand just outside the sliding door, looking inside the room, how is it that Tom is still inside whilst Neri is outside!
4. Neri goes into the corner, squats on the floor with his back to the room and is smoking
5. Later we see Neri squatting, facing the room, I bet trying to lip read!

Whilst I too “cannot even imagine! anyone “demonstrating their dissatisfaction” to Michael about anything he said or did” Neri seems to but undoubtedly only because Neri knows Michael cannot see him!