The black dealers I see do invite everyone and their momma.
It may seem like that to you, but there is a reason why they're constantly looking over their shoulders. As for most of what you said I agree. I'm not arguing that the environments are the same, I'm saying that there are just as many white people involved in drug use and selling as there are black. The only difference is one is getting arrested more than the other.
I'm interested more in the mechanics of how police find and arrest those folks.
It's a structural thing and while I think it deserves being said that things are being done differently, the legacy of racially unjust enforcement is that a cycle exists within one community which operates very differently in the other, a difference that acts as the fulcrum for what you see.
The only reasonable way to break both sides of the fulcrum is legalization with paths into legitimacy for existing distribution networks, but racial justice in education is a huge first step.