The defense mechanism that Tony is demonstrating when yelling at people who were also in the grocery store is displacement, which is used when you want to unconsciously transfer an emotional reaction to other objects or people.
According to psychoanalysis, defense mechanisms correspond to a set of unconscious psychological actions to reduce any situation in which there is a threat to the integrity of the ego, generating defense responses that relieve psychic tension.
In Psychoanalytic Theory, Freud developed nine major defense mechanisms, with displacement being the mechanism Tony uses when he shifts focus from a desired action to a substitute target for some reason.
Therefore, when Tony has a telephone conflict with his wife and for that reason yells at the other individuals at the grocery store, he is utilizing the displacement defense mechanism.
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