@tsarstepan,
No, I personally wouldn't boycott Barilla over that, and Barilla is a brand of pasta I generally buy. I like the Barilla Plus pasta because of its high protein and fiber content, and that's what influences my choice, not the type of family they depict in their advertising.
If they want their ads to only show a "traditional" family, what's the big deal? Off-hand I can't recall seeing ads for any products that show gay or lesbian families, and ads showing interracial families have just begun appearing.
Ads are designed to sell products, and to appeal to certain demographic groups, and if Barilla is doing just fine using the traditional family image, why should it want to change that? Most gays have grown up in traditional families, and are part of these traditional families, so they can connect with these ads as well. The purpose of the ad is to peddle the pasta.
Are all corporations under some obligation to promote gay marriages and gay families by showing them in ads?