Good for UC.
When I taught, the only two things I ever did that could be remotely construed as "trigger warnings" were acknowledging on the course syllabus that one of my topics classes addressed violence and violent material, so it was not for those who found such things offensive, and warning students - typically only right before pressing "Play" that the film segment we were about to dissect in class used a lot of cursive and/or demeaning language that some might find offensive.
But that's really just what ought to be considered good taste, not necessarily a "warning."