Absolutely. If you got white power tats on you, you are clearly a piece of shit. If you have actual gang tats on you, probably a pieces of shit as well. But most people with tats just have tats. I am not sure on the legality of denying a sale based on horrible tattoos. If that is allowed, it is going to result in way more racists refusing sales to minorities, vs normal people refusing sales to overt racists.
If you want a real world example on this, not a hypothetical, it used to be fairly common in many states to need a sheriff to sign off on a pistol purchase. The state I moved to, Missouri, had this as law when I first moved here. It was part of the various Jim Crow laws.
