Turmoil in tiaras at Miss Universe in Thailand

This year's Miss Universe in Thailand has been marred by ugly drama, with allegations of an insult to a beauty queen's intellect, a walkout by pageant contestants and a tearful tantrum by the host.

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More than 120 women from across the world have gathered in Thailand, vying to be crowned Miss Universe in a contest considered one of the "big four" of global beauty pageants.

But the runup has been dominated by the offstage antics of the coiffed contestants and their Thai hosts, escalating into a feminist firestorm drawing the attention of Mexico's president.

On Tuesday, Mexican delegate Fatima Bosch staged a dramatic walkout -- in an evening gown and high heels -- from a meeting where she was lambasted by Miss Universe host Nawat Itsaragrisil.

In a livestream of the event, Nawat seemed to single out Miss Mexico and call her a "dumbhead" during a dispute over her apparent failure to post promotional content on her social media. He has since denied using the term.

But after Nawat called for security to intervene, the besashed Bosch staged a walkout flanked by Miss Iraq, who wore a bejewelled floor-length robe.