That happens on here too. Then when someone says something that could be construed in any way as racist - ie Ron Paul is against the federal reserve, Ron Paul is anti-Semite! (because Jews work at the federal reserve? I don't follow the logic actually).
It happens also if you point out other things. Charges of racism can be used to hide all sorts of crimes.
In example - five examples of things that are true but covered up this way:
And for the support of this Declaration, with a firm reliance on the protection of Divine Providence, we mutually pledge to each other our lives, our fortunes and our sacred honor.