
"It's shameful (to slap a woman's face). Whoever started such violence is unacceptable as it is a threat to people's rights and freedom," the alternative university said in its statement.
"We want to condemn the red-shirted people and ask police to bring the wrongdoers to punishment," it said.
Last Saturday, supporters of former prime minister Thaksin Shinawatra broke into the university's auditorium to eject Deputy Prime Minister Suthep Thaugsuban, who was attending an alumni reunion.
Pensuwan Nakapreecha, director of the university's library, was assaulted by the protesters after she tried to stop them from entering.
The statement said any political groups or parties should have realised that a political goal could not be attained by uncivilised and illegal ways or by attacking a weaker person.
Midnight University also urged people to stop supporting any bullying political groups that tried to win political points without considering the means.