There's nothing wrong with voicing disagreement. However, if you want to disagree, you put together your own forum and voice your concerns instead of taking someone else's forum. You want to put a one-page ad in the New York Times stating "General Betray Us"? I might disagree with your message, but there's no issue whatsoever in using that platform, and quite frankly, I will defend your American privilege to do that. Crashing and disrupting a hearing in an effort to silence someone is where the issue comes in. Spraying pink paint over a poster because you don't like the message is a similar form of disruption. One person has just as much a privilege to have his/her voice heard as the other.