White folks I know who deal this way deal to people who already have a tendency to be friends, at volumes and times which are easily brushed off as "normal social interaction."
You keep alluding to things like this. black drug dealers mostly sell to people in their own community. People they see everyday and know. They don't invite everyone and their momma to a transaction like some pan handler. They get caught when they get greedy and/or someone in the community sets them up (which happens often because black people do care). However they are mainly getting caught because they are doing it in the streets. It's not a difference in behavior. Both white and black people are selling drugs. The only difference is why one is doing it in the streets and the other isn't. It's the raids. White drug dealers would change their behavior (just like black people) if their homes got consistently raided. Anyhow you seem to agree with the part that white people are ok with drugs being sold out of homes because it takes a decent amount of looking away on the communities part (unless they don't know shit about each other) for there to be no snitches. Or there are snitches and the police are too focused on black people to care.
And the communities I talk about are different. It's hard to quantify the observed difference at times.
The black dealers I see do invite everyone and their momma. They say "loud loud loud" outside a bus stop and think cops can't track them back to the less sketchy drug dealers they bought their supply from.
There's a big difference in supply chain security between communities.
I don't know enough white dealers who deal drugs in such a way as to provoke raids.
They don't throw parties at their houses, they don't play music late at night, they don't drive cars that look like they deal drugs, they don't associate with other people who sell drugs.
Most wouldn't sell drugs to anyone approaching "having a problem".
They get their drugs through the USPS and never even meet the people they buy them from.
Nobody in any of the neighborhoods of any of the white drug dealers I know know they are drug dealers.
The things that get the homes of black drug dealers raided consistently is the closeness of the distribution networks, the interpersonal ties between gang members, and the numerous social messages which encourage loose living and seeking to be "big".
None of them "act with disposable income."
None of them feel any need to "protect their turf"
Many of them will deal directly in digital currency.
I've seen the inside of white drug networks and they are shaped nothing like a classic gang. There are also only generally 1-2 low profit actors per group of 200. The suppliers are anonymous, online and use escrowed trading to get paid. There is no violence in the system and no obligation to participate, either.
The behaviors are structurally different owing to the fact that the communities many white people today participate in connected based on common interests rather than family ties.
I suspect in rural white areas, it's a bit more obvious who deals?
But in urban environments, the structure of the black community often leads to the difference in visibility and enforcement, which is still systemic and structural racism but which end up finding their cause in real differences in behavior.
It's not that my community doesn't know what people are up to, but most of the people in my community also don't live near each other, and aren't much enmeshed with the people the do live near and visit each other at weekly or monthly intervals whether there are drugs involved or not.
There are also fewer vectors for forced inclusion of problematic people in both distribution and purchasing: family participation is rare, and it isn't usually treated as a major source of income. There is no pressing need to operate "for profit".
Things would be different perhaps if the community was structured around a common struggle against racism, or was gripped by poverty.
I suppose other elements might include the religious aspect, insofar as the communities I participate in are not bound to such moral struggles as a fight between gang culture and the "church crowd".
I don't have to deal with any church ladies in my personal life, and rarely do I ever seek jobs where I would have to deal with strongly drug-averse employers.
Again, this is all systemic, but is driven by real differences in behavior nonetheless. It is systemic because the behavioral models which keep white dealers from enforcement simply are not available in black communities.