I will be waiting for a reply from the company. I have no problem with hitting the company hard, but my response will depend on their reasons.
Our local bank, like most banks, has a similar sign. However, we are welcome to carry there. The only reason for the sign is to satisfy an insurance company rule. I have written the insurance company on this one, and CC'd the bank officers (I didn't tell the ins. co. that the bank pres. wasn't enforcing the sign).
On the other side, we have some small businesses around here that are "gun free" because mom and pop want it that way. I have made them aware that their hatred of my Rights has lost them a customer.
Do it because you are forced to, and I will work with you to right it ... Lead the way on your own or willingly follow and I will fight you!