Hey AfriPrincess
You raise an interesting point, but if this is the case, why do they not assume our short or mid-length hair (when permed/straightened, for example) is a weave?
Ultimately, there is an underlying assumption that Black women can't have long hair...
Even on the forums, I've seen many people attribute "long hair" to somehow being "White" (huh?). However, I'm in Europe and I very rarely ever see women walking around with long tresses. Even my hair (which I consider to be fairly short for NY standards) is much longer than the women I see out and about or when I'm traveling in Europe. And in NY, the women that I typically saw with long hair that was their own (that is, those women who weren't AA) were often Mexican or PR. I'm getting a bit off topic, though...
Also, so many of us have assumed or claimed that folks like Jill Scott, Badu, or even Lauryn Hill are wearing weaves/wigs (whether or not they actually are and whether or not it was eventually proved or disproved).
I think that when it comes down to it, the thing that seems to make everyone suspicious is length and thickness, regardless of texture.
I have a problem with C. Rock clowning Black women based on stereotypes (even if the stereotype holds true for certain regions of the US). We've got to demand better for ourselves as Black women...