Only the left would protest somebody’s presence by refusing to let them leave. That’s what happened following an appearance by Karl Rove at American University. After pelting his car with assorted objects, they decided to lay down in front of his car, preventing his departure.
You would never see that on the right. Sure, there are people who would pelt your car, but they would do so in an effort to make you go away. Once you decided to go, they wouldn’t change their mind and try to make you stay.