Unclear on the concept of "Free Speech"

I have to say, there are a lot of people in the Tea Party (and others from both sides of the political spectrum) who are unclear on the concept of "Free Speech".  Whether describing poor Dr. Laura, Sarah Palin or now the Tea Party, they seem to confused disagreement with trying to curtail their free speech.
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If someone disagrees with you and says so, even when they do it loudly, that isn't trying to "silence you". It is engaging in discussions.  Granted, you may not like what they say, but it isn't an attempt to silence you.  It may be an attempt to discredit you, or to disagree with you or even point out some of your errors.
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You see these assholes below.  Trying to discredit them and point out they are kind of bad people isn't curtailing their free speech.  Disagreement is a form of speech.