City cruised to a 3-0 derby win on Sunday, though Amorim offered a calm response in the aftermath.
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Keane reacted to the United manager's assessment, stating: "He said there he's not too angry, he's happy with the effort...they have lost 3-0 in a derby game. You should be fuming, you should be raging.
"He is talking about moments, but football games are decided by moments. It always seems to be moments of the opposition than United at this moment in time, and I am including teams like Grimsby by the way.
"He should be raging, I like managers who are emotional but I like my managers to show anger as well. I just couldn't imagine being in a dressing room after losing a derby game 3-0 and everyone going 'did we all try?'"