can say anything. It was put in the Constitution to protect the suppressed. According to the geniuses at Wellesley College.
Lots of vague references to, hate speech. I imagine that will be defined on a case-by-case basis, depending on who says it, and about whom it is said.
https://heatst.com/culture-wars/student-newspaper-of-hillary-clintons-alma-mater-openly-threatens-those-who-refuse-to-adapt-their-beliefs/