Please Don't Post
The Tennessee Firearms Association has a card available to be left at establishments to let them know that you will not support businesses who oppose your rights. You can find the card here. According to TFA,
The purpose of the card is to provide a polite and non-confrontational means of communicating to businesses, including restaurants, that permit holder are or have been patrons and that we are requesting that they do not elect to post their properties against handgun permit holders. In the context of a merchant, for example, the cards can be left with the payment, left with a tip, handed to a host and/or the manager. It is not necessary to verbally debate the issue.