Here is what you can do if you witness sexism or harassment:
Refuse to be complicit in inappropriate behaviours: for example, do not take part in inappropriate or sexist comments or jokes, or if the situation permits, speak to the person engaging in these kinds of behaviour;
Offer your support to the target person: talk to them, encourage them to act, point them towards the relevant bodiesand make yourself available as a witness if a complaint is made;
In the case of cyber-bullying, report problematic messages exchanged on a social network between members of the university community to your Dean’s office or head of department.
But don’t do anything without the target person’s explicit consent!