When I worked as an RSO at an indoor range, we used to get all kinds. Groups would come in, with waves of marijuana smoke pouring out of them.
"Heeeey, can I, like rent a gun?"
" No, leave now."
Gangbangers would walk in, and try to imress thier girlfriends by shoving their cheap POS at the target while firing, and extra FPS maybe? They were invariably the worst shots I ever saw.
One idiot asked me if we did firearms repair, and when I said yes, he produced a Tec 9 with a broken frame! Snapped clean behind the magwell all the way across. I had to tell him the gun was a total loss, and he thought we could GLUE it back together!
I would not judge people by skin color or race, but when they dress/talk/act/smell the "steretype", then it's not my fault for making an obvious connection! Remember the old "walks like a duck, quacks like a duck" theory?