It is the latest outburst of public anger over how authority figures treat underlings in a country where complex hierarchies are deeply entrenched.
The family of 17-year-old student Narudee Jodsanthia went public via local media this week after negotiations with the school over medical costs broke down.
They allege that Narudee was left with facial nerve damage, causing a permanent droop on the left side of her face, after a physical education teacher threw a ceramic cup at her head in early August because she and some friends walked away from an area where they had been ordered to sit.
The teacher has been transferred to another school while local education authorities investigate, said Chukiat Visetsena, the director of the education zone where the school is based.
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Narudee posted photos of her injuries on Facebook. "The teacher thought that we were not obeying him so he threw a coffee mug at random and it hit me," she wrote.
A number of similar recent incidents have caused anger, with powerful figures routinely avoiding prosecution.
The same week a Thai Air Asia stewardess was forced to prostrate on the floor before a disgruntled passenger, prompting an apology from airline boss Tony Fernandez.
Thailand has a hierarchical society in which teachers are afforded huge respect.
But many education reform advocates argue such extreme deference discourages critical thinking, pointing out that education standards in the comparatively wealthy nation have been slipping for years.
Since seizing power in a 2014 coup, junta chief Prayut Chan-O-Cha has ordered all school children to recite his "twelve values" daily, which include respecting parents, teachers, elders and "maintaining discipline".
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