If you don't understand how the Left would threaten or verbally assault a girl like this, then here is your short course in basic tenets of Leftism:
1. All speech is based on imperfect knowledge and understanding.
2. Therefore, there can be no objectively true statements.
3. Thus, all speech is only opinion.
4. Everyone is always engaged in some form of class warfare, even if they don't know it.
5. Thus, all speech's purpose is at bottom about retaining or enhancing one's position within the class system.
6. This means that speech is about power.
7. The Left is always the underclass and is always being oppressed.
8. This 14-year-old girl is an oppressor.
9. Therefore, there are no civil boundaries to silencing her oppressive speech.
The longer course is here and here.
Friday, November 2, 2012