Seems to me that this had already been covered by the thread about Earl's in Texas. Consensus is that a business owner has the right to establish the rules he or she wants on his or her private property.
This was articulated quite emphatically so it seems to me case closed. The fact that it applied to gays and not gun owners should be irrelevant IMO. Thanks OP for posting this cuz I want to see how many people are gonna hem and haw and waffle on their previous position 'bout the rights of business owners and property owners to do what they damn well please. Hope this thread takes off , like a blazing rocket ship to Mars.
From my perspective concealed means concealed and if you get caught be willing to face the consequences, but that's just me. What you do on your own time is your business but your employer might not see it that way. Discretion is the better part of valor .