Yep if they refused to serve gun carriers, I'd protest them. Instead - once I figure out for SURE who they are and how to contact them, I'm going to be ordering some food long distance. My way of "'helping the cause". They are free to protest, and I'm free to agree or disagree... and that's the way it should be. As has been pointed out, lots of us refuse to patronize stores that insist on "no firearms" signs. This is roughly the same.
Positive reinforcement does work. When the Starbucks stink was going on I talked to a manager and told her thank you. Even though WI was not affected by this, you would have thought I had proposed to her. She got a great big smile on her face and said thank you, so much. "We've had a lot of people stopping in and saying the same thing". For all of the people (TSA, etc) who do this crap we still out number them!
Put a TSA person in a zombie movie, what do you get? Someone who repeatedly keeps saying we want to touch your junk! Forget brains.................. those have long been lost.