A few years ago the Communications Workers of America (CWA) ran radio ads that attacked Bell Atlantic (now Verizon) and its use of subcontractors as repair persons.
I called one radio station and talked to a gentleman there, telling him that I thought the ads were unconvincing. Instead of answering my concern, he went into a diatribe about how the station and the union had "First Amendment rights" (a point with which I had no dispute at all).
In other words, instead of defending the union position, all he did was namecall.