ACLU to Coal Baron: “You Can't Sue People for Being Mean to You, Bob.” (hollywoodreporter.com)

You can sue people for anything. Works better if you sue someone without enough money to defend himself, though.

You can if its defamation.

Here's the internet's favorite copyright attorney talking about this. It's a fun read. https://www.youtube.com/watch?v=Or0sfrz93O4

I love streisand