Do blacks perceive more discrimination in high-black or low-black regions?

I don't know if anyone has put forward the hypothesis in some formal way, but I have run across the idea that while mistreatment by whites is common among blacks generally, it's REALLY bad in areas with few blacks. The reasoning seems to be that whites are very racist everywhere, but concentrations of blacks are able to push back and suppress the discrimination to some extent. By contrast, isolated blacks are more powerless and consequently have it really bad.

The General Social Survey (GSS) asked blacks, "How much discrimination is there that hurts the chances of blacks to get good-paying jobs?" Since there were only 152 respondents, I took the nine regions used by GSS and collapsed them into two: one high-black and one low-black category.
I also divided up the country into North vs. South under the assumption that the South is more racist.

Answers ranged from "a lot of discrimination" (4) to "none at all" (1) so higher numbers indicate greater perceived discrimination. Here are the means:

Mean perceived job discrimination

North High Black  3.56
North Low Black   3.38
South  3.29

The region with the greatest perceived discrimination is made up of parts in the north that have the most blacks. Contrary to the stereotype, there is no evidence here that the South is more racist--it scores the lowest. In the middle are low-black areas in the north. When I say north, I mean the mountain states and the west coast as well as the north proper. (You don't see a low-black southern region because there is no such place in GSS data.)

So GSS data contradict the view that black communities that are small, isolated, and surrounded by many whites have it really bad. Blacks think they have it better when their numbers are small.

My guess would be that perceived discrimination is affected a great deal by exaggeration, a phenomenon that gets magnified among large concentrations of blacks.

UPDATE: This hypothesis of large numbers magnifying the perception of discrimination doesn't work for the South which has many blacks but scores the lowest on discrimination. A reader suggested that progressives encourage blacks to see mistreatment, but some low-black areas contain many liberals: the West Coast, New England, Minnesota. I wonder if the perception of bias depends on how one is treated when applying for a job. Southerners and perhaps many people in low-black areas might have a softer touch than employers in places like Chicago or Detroit. Discrimination is typically an ambiguous thing. People are not going to admit that they're not hiring you because they don't like blacks, so people have to rely on cues. A brusque manner could be interpreted as bias.

Data: Dot Indians are the most industrious Americans. Feather Indians, the least. Hispanics are in the middle.

Sociologists assume that a man lacking a job is the fault of the economic system. He would take any job if it were simply available.  Common sense and behavioral genetic research contradict this. Industriousness is largely caused by genes, and people vary a great deal in this trait. Some people cannot take it easy, and some cannot not take it easy. I've talked to many people over the years who refuse to take jobs that are not acceptable to them.  That's the reality in America. Sure, you might have a small percentage with REAL health problems, but those are the exceptions. 

So I'm going to use full-time work as a measure of industriousness.  I'm interested in racial and ethnic differences. Men and women still differ in employment, so let's focus on just the men. Here are the percentages of American men ages 30-64 who are employed full-time listed by ethnic group:

Percent employed full-time

Asian Indian  85.0
Jewish  84.0
Dutch  84.7
Portuguese  82.6
Japan  82.2
Russian  81.8
Spanish  81.8
Greek  81.6
Romanian  80.0
Polish  79.3
German  79.1
Mexican  78.7
Italian  78.6
West Indian  78.6
Danish  78.5
Norwegian  77.6
Austrian  77.5
Scottish  77.5
Chinese  76.9
Hispanic  76.9

US Total  75.7

Irish  75.7
English/Welsh  75.4
Czech  74.8
Swedish  75.3
French Canadian  75.1
Belgium  75.0
Arab  74.7
Hungarian  73.5
French  72.9
Filipinos  71.4
Muslim  71.2
Puerto Rican  68.6
Black  67.4
Lithuanian  67.4
Finnish  66.7
American Indian  55.6

Looks about right. For a moment, let's compare the top group with the lowest. If it were true that discrimination determines who works, why would Asian Indians surpass every single white group?  Wouldn't a bigot choose the lamest white person over a South Asian?  While American Indians are also non-whites, at least most of them are Christians. Wouldn't a bigot choose a Christian over a heathen Hindu?  American Indians have a tragic history, and whites feel bad about that. They were here long before Europeans. Wouldn't an employer choose a Real Red American over an immigrant invader, just off the boat?

And yet, Asian Indians tower over all other groups. Why? Because biology explains better than sociology.

By the way, I'm at a cafe, and seated at the next table over is a Native American. He's super friendly. He's always here, and I'm not sure he's old enough to be retired, but he doesn't seem particularly busy. The Asian Indian guy I always see here is also popular, but he owns a business and uses the cafe to network.