Doesn't really sound like you have to profile as a gun shop employee/owner. You just have to be mindful of everyone and watch who is breaking the law regardless of clothing.
I have customers who pay cash for motorcycles. In fact, recently two guys came in with a lockbox full of cash and bought 2 sportbikes. They looked like hoodrats, and they smelled like they each had a dank bud in each pocket. Since I don't work in law enforcement, I wasn't worried about their cash or their buds. Of course, recently, I sold a yamaha Rhino™ to a guy who was white, middle to late aged, and formerly was a LEO who paid in cash to the tune of several thousand g's.
did I wonder where the money came from? sure. How does an honest cop retire and have enough money to buy a 42 thousand dollar diesel dualie, a 2nd home at the beach, a country club membership, and a nearly $10,000 atv toy?
I also wondered about the young men that rolled in to the parking lot in a blinged out donk 79 Caprice. Where'd they get 10 g's?
But, I work for a living, invest pretty wisely, and am not middle aged and somehow am able to pay cash for anything I want. So, it's not that uncommon for me to walk around with 1000 dollars on my person at all times.
You can conjecture all you want about gang bangers vs. people in suits, but it comes down to RKBA and who is and is not breaking the law.
After all, I see an awful lot of young black men dressing like gang bangers just to get along the same way I see young rural white guys jacking up their trucks, shaving their heads, growing goatees, and putting rebel flags on everything they own. People are just trying to get along and looking like a tough guy has always been a way to do that.
When I was a long hair with wire rimmed glasses just a year or so ago, I got a lot of stereotypical comments in the gun shop. And, when I went to the gym, I had cops eyeballing me all the time and making whispered comments to each other. Now, I have a mil-spec haircut (I donated my hair to lockoflove.org) and wear contacts and am a pretty clean cut guy. Cops chat me up in the lockerroom and on the gym floor now, like I'm one of them (I bought a shirt that reads "Pleae don't spit in my food. I'm not a cop"). Even my co-workers call me "Trooper".
The way you dress and groom yourself will make a difference. But, young people haven't had time to realize that, or aren't in a place where they can effect that change because all they want to do is fit in and be part of the group. And, that's okay. Part of growing up is finding yourself. And so is learning to deal with other's prejudices.
So, really all that matters is who breaks the law, not how you dress. I don't like Gangbangers anymore than I like rogue cops, unfair laws, or racism/classism. But, we don't live in a perfect world, do we?