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It's all free speech? Laura is on a show. She is welcome to express her views on her show at the pleasure of her employer. Advertisers are welcome to buy or not buy depending on how well the show's views, audience, etc fit their target clients, budget, etc.
David is likewise free to express his pleasure or displeasure at Laura's comments, express that to people and/or corporations, etc. As long as none are running afoul on laws that limit speech, they are free to express themselves how they feel appropriate.
...and though all may be free from criminal consequences, none are guaranteed freedom from social consequences, should such exist.
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