No, they aren't infringing on his right. He can still purchase a firearm somewhere else. If you are banned from TGT has TGT infringed on your right to free speech? No. He was discriminated against for his age, which would apply whether they used that readon to deny the sale of a firearm or a head of lettuce. The firearm just happens to be the product in question but the product holds no relevance to the law which the case is based on.