(RNS) Focus on the Family Chairman James Dobson has encouraged listeners to his radio program to boycott products of the Procter & Gamble company because of a "tacit endorsement of gay marriage," but the Cincinnati manufacturer says conservative groups are mistaken about its stance.

"For Procter and Gamble to align itself with radical groups committed to redefining marriage in our country is an affront to its customers," Dobson said in a statement released Sept. 16 by his Colorado Springs, Colo.-based ministry.

Procter & Gamble's donation of $10,000 to a campaign for the repeal of a city ordinance barring enactment of gay rights laws is not related to the marriage issue, said company spokesman Doug Shelton.

Dobson recommended that his listeners boycott two of the company's brands: Crest toothpaste and Tide laundry detergent.