The Labour leader's brutal swipe came as the Prime Minister resorted to shouting over him during the final election TV debate.
Desperate Mr Sunak repeatedly interrupted his rival as they clashed on tax, immigration and sleaze during the 75-minute showdown on BBC1.
Mr Starmer got a round of applause for telling the PM: "If you listened to people in the audience [and] across the country more often, you might not be quite so out of touch."
He added voters have had enough following 14 years of Tory failure.
After an audience member said people are "dismayed by the lack of integrity" in Westminster, Mr Starmer said if he becomes PM he would "reset politics so it returns to public service".
He added: "This is a question of leadership because this isn't just what's happened this week and last week with the Gambling Commission.
"We saw Partygate earlier in this Parliament... And we have seen what happened with the Covid contracts."
He also talked about how he suspended a Labour candidate being probed by the Gambling Commission "within minutes", whereas Mr Sunak waited almost two weeks to take action against Tory candidates.
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