I once heard my senior brother talk about a gossip:

A female master's student mentored by an associate professor at our school asked a third-year master's senior brother for help, but he refused.
Then, out of anger, the sister smashed this guy's graduation project, and he slapped the female student in the face.
The female student cried and went to complain to the associate professor, who scolded her.
Later, she falsely accused the senior brother and the associate professor of assault, but it was verified that she was lying.
Unfortunately, the associate professor missed the opportunity to be promoted to full professor that year, and the third-year master's senior was forced to delay graduation by a year.
When our school's master's and doctoral supervisors recruit students, they are almost all male students.
Even if a female student's grades are dramatically better, those teachers would rather take a lower-scoring male student than a higher-scoring female student.