Yes its true, all black men are hung, all white men are average and all asian men are small. Along with all redheads are irish. All redheads have a temper. All white women have flat asses. All black women have big breasts. All Asian women have no breasts. All mexicans are from Mexico. All Africans can run faster than we can. All tall people play basketball.
Just because all aren't doesn't mean there can't be a correlation. For instance, in your examples, not all tall people play basketball, but taller people do indeed tend to. White women do indeed tend to not have as much ass as black women and Asian women do indeed tend to not have as much ass as white women. This all or nothing mentality that so many have is illogical. Not all myths are true and not all myths are false. In some the truth is found somewhere inbetween. Just like it's commonly believed that upon erection growers become equal in size to showers, my study of databases found that, generally speaking, growers only gain some ground but do not catch up. So the common thinking about growers and showers is partly correct, but mostly incorrect. See, the real truth was somewhere inbetween. It's not always all or nothing.
Menopause and Menstruation and their Hormonal Manifestations
[abstract]
"The ethnographic record {e.g., A French Army Surgeon (1898/1972), a 30-year specialist in genitourinary diseases} makes reference to numerous anatomical distinctions which show a similar pattern of whites being between blacks and Orientals. These include the placement of female genitals (Orientals front and high; blacks back and low); angle and texture of erection (Orientals parallel to body and stiff, blacks at right angles to body and flexible); salient buttocks, breasts, and muscularity (Orientals least, blacks most); and size of genitalia (Orientals smallest, blacks largest). We averaged the ethnographic data on erect penis and found the means to approximate: Orientals, 4 to 5.5 in. in length and 1.25 in. in diameter; Caucasions, 5.5 to 6 in. in length and 1.5 in. in diameter; blacks, 6.25 to 8 in. in length and 2 in. in diameter. Women were proportionate to men, with Orientals having smaller vaginas and blacks larger ones, relative to Caucasians. Clitoral size differed in length: in European women, 1.2 in.; in African women, 2 in. variations were noted; in French West Indies, the size of the penis and vagina covaried with amount of black admixture"