The man has politley asked people to not bring a gun to his coffee shop,SO DON'T BRING A GUN INTO HIS SHOP! Why does this have to be such a big deal for some people?
For the same reason gays have a hissy fit when somebody doesn't want to bake them a wedding cake I guess.
It looks like you guys are the ones having the hissy fit over a company just asking people not to bring their guns into their place of business.
I doubt most gun owners actually feel their right to own a gun includes being able to carry them into other people's private homes and companies. In which case, if a business should have the right to refuse service to someone pursuing the legal practice of gun carrying/ownership. Then they should, furthermore, have the right to refuse service to anyone on whatever grounds they personally find relevant to their own moralities, yes?