This is not a study, but provides an example of "safe space liberalism" gone too far in a university. In here, students heckle the speakers trying to introduce dissenting opinions on that "safe space liberalism". It's 1.5 hrs long, but you might want to begin at the 2 min 45 sec mark to see the worst of the heckling begin.

https://www.youtube.com/watch?v=yCcp36n2cDg