"President Duterte acted like a feudal king who thinks that being the President is an entitlement to do anything that he pleases", said Senator Risa Hontiveros, who asked the public not to pass judgement on the woman.
"Well, this 4.9 billion worth of investments and thousands of new jobs, and one billion dollars in ODA - that (the kiss) possibly can't overshadow the harvest of the President on this trip", he said. "But can you tell him that this is just a joke?".
Feminists have denounced Duterte for his "perverted ways", though many Filipinos thought the kiss was just harmless fun. The crowd was loudly teasing the President and the lady to seal it with a kiss already.
"Kissing an ofw in front of a public event in another country is so unethical, the line between ethical and unethical, moral and immoral are blurred to Duterte as long it serves his personal interests", another woman wrote.
Philippines President Rodrigo Duterte has told a U.N human rights expert who said the country's judicial independence was under threat to "go to hell", warning against interference in domestic affairs.
"They should be able to criticise Duterte's inappropriate and wrongful actions, because when people start tolerating a leader's offenses, it becomes blind fanaticism".
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The controversial incident took place when Mr Duterte was speaking to a crowd of overseas Filipino workers (OFWs) in Seoul.
"You don't have to kiss that woman if you want to entertain people", said Joms Salvador, secretary-general of Gabriela Women's Party.
Duterte's latest profanity-laced diatribe came after Diego Garcia-Sayan, the United Nations special rapporteur on the independence of judges and lawyers, said the president's statements against former chief justice Maria Lourdes Sereno were a "vicious attack" on the judiciary.
She recalled telling that president that she is married to a Korean national, and that they have two children, adding that she agreed to the kiss to "amuse the audience".
"I was angry because she was raped", he said. But she was so handsome the mayor should have been first.
In February, he ordered his troops to shoot female rebels "in the vagina".
"Make him jealous", the President said.