"So, if Kellogg's wants to shrink the market for Frosted Flakes by 50 per cent, fine: let's frost 'em out, until they understand that, in politicizing everything, they're the flakes."

Mark Steyn hates the idea of boycotts, but...

I hate boycotts, too. I want to be free to reject Kellogg's cereals because they suck rather than because buying them is a political act. But John Hinderaker's right: This is a one-way street that leads to a de facto one-party state, or at any rate a one-party culture. The left wants a world in which a discount furniture warehouse is free to advertise with Rachel Maddow but not Rush Limbaugh. And in pushing further and further down that path they make everything political, and render normal civic life all but impossible - to the point where the CEO of something as universal and unobjectionable as Kellogg's Corn Flakes finds it easier to side with the losing side in a free election, and against half of his fellow citizens. So, if Kellogg's wants to shrink the market for Frosted Flakes by 50 per cent, fine: let's frost 'em out, until they understand that, in politicizing everything, they're the flakes.

Will they get away with it? Other corporations that prioritize politics over products aren't:

Not only has ESPN and the NFL willfully entered into the political fray, so did Anheuser-Busch InBev - to the same detrimental results.

After the beer company aired an advertisement featuring comedians Amy Schumer and Seth Rogen this October that was preachy, unfunny, and political, Bud Light sales were destroyed.

Read more here.

Kellogg Foundation supports Black Lives Matter

Aaron Klein reports at Breitbart, The W.K. Kellogg Foundation, which maintains strong financial ties to the Kellogg Company, has provided at least $930,000 in support of the controversial work of the Black Lives Matter organization.

...On Tuesday, the Kellogg Company announced its decision to pull ads from Breitbart News, explaining its 45,000,000 monthly readers are not “aligned with our values as a company.” In response, the news agency launched a #DumpKelloggs petition and has called for a boycott of the famous food manufacturer.
Read more here.

I think they are both being stupid.

Kellogg's is pulling all ads from the Breitbart sites. Kellogg's says that those of us who read Breitbart don't share their values. Breitbart, claiming to be pro-freedom of speech, is asking us to boycott Kellogg's products.