The people posting disparaging remarks on their Facebook page are probably not their regular customers. The kind of people who eat at CB are generally overweight, elderly Midwesterners. The kind of people who would freak out enough to scream at them on Facebook are emotion-driven liberals. Starbucks people.
Guess you don’t do much Facebook. Most of the people chiming in are veteran families. Of course, they could be lying but they use their real names on FB, unlike here. Facebook is considered liberal but there are thousands of conservatives on it. Maybe hundreds of thousands. A lot of people are complaining about the Duck Dynasty fiasco which leads me to believe they really are conservatives. (Of course, libs are chiming in, too.)