As I understand it, CAIR has launched a campaign to boycott advertisers on his program. This is an example of CAIR using their freedom of speech.
A great many Freepers have proposed boycotts of advertisers on programs they disagree with. It is a perfectly legitimate tactic, although difficult to implement effectively.
CAIR is a terrorist, sharia law organization. They use threats and intimidation, such as lawsuits to shut down anyone that tells the truth about the Religion of Death.
Not a boycott in the traditional sense.