Looks like people’s efforts have paid off. UC Davis finally catches up to other UCs with an online hate incident reporting scheme. See here: http://studentaffairs.ucdavis.edu/reportit/
It allows anonymous reporting. If you are reporting anonymously, try to access it from off-campus like at a cafe with free wireless. On campus, they can associate anything with your login.
Hopefully UC Davis will take the reports seriously. In case they don’t, I would also report any incidents to the UC-wide online system here: https://ucsystems.ethicspointvp.com/custom/ucs_ccc/default.asp