I don’t have any problem with this decision. To begin with, the restaurants are private property and Whataburger has every right to set the rules for guests on its premises. Second, this restriction applies only to open carry weapons and does not prohibit customers with concealed weapons.
Either do I; business decisions are made every day for numerous reasons .... they’ll learn soon enough whether it was s sound decision or not.
I wouldn't go into a Whataburger anymore.