Zeid Ra’ad al-Hussein said the Nobel Peace prize winner should have risked returning to house arrest rather than being a “spokesperson of the Burmese military”.
“She was in a position to do something,” Mr Hussein told the BBC. “She could have stayed quiet – or even better, she could have resigned.
“There was no need for her to be the spokesperson of the Burmese military. She didn’t have to say this was ‘an iceberg of misinformation’. These were fabrications.
“She could have said, ‘Look, you know, I am prepared to be the nominal leader of the country but not under these conditions.
“Thank you very much, I will resign, I will go back into house arrest – I cannot be an adjunct accessory that others may think I am when it comes to these violations’.”
Ms Suu Kyi spent 15 years under house arrest because of her campaign to bring democracy to Myanmar, which was ruled by a military junta for 49 years.
Her efforts made her an international symbol of courage and peaceful resistance to oppression, and following her release she led the National League for Democracy to victory in 2015, in the nation’s first openly contested election for decades.
But she has been strongly criticised for failing to speak out against the persecution of Rohingya, more than 700,000 of whom have fled the Myanmar’s Rakhine state for neighbouring Bangladesh since the military began a violent persecution of the ethnic minority in late 2016.
Rohingya crisis one year on – Myanmar camps in pictures
In the damning final report of a UN fact-finding mission, investigators said Myanmar’s commander-in-chief and five other named generals should face prosecution for crimes against humanity and war crimes.
Myanmar’s government has dismissed the report, accusing the international community of “false allegations”, and said its army had been responding to a legitimate threat from Rohingya militants.
“Our stance is clear and I want to say sharply that we don’t accept any resolutions conducted by the Human Rights Council,” Zaw Htay, the government spokesman, said.
He suggested the UN’s conclusions could not be trusted because Myanmar had blocked investigators from entering the country.
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