See post #11, #15, #40, #57, #109, #119, #121 (in particular).
Okay. Are the following quotes from those posts the purposes for which you asked the original question? If not, please identify the quotes from those posts that do so.
Post 11
"We have never been able to clearly define just who is "white" and who is "black"."
Post 15
"I am saying that, when we approach the boundaries, it gets tricky."
Post 40
"when we talk about who gets a college grant based on skin colour, somebody somewhere has to draw that single thin bright line. Someone might draw it somewhere else, for another purpose. I want to know what they base their decision on."
Post 57
"White people could simply self-identify as a minority group (as needed) and get better deals than they would have as a majority."
Post 109
"If you segregate based on how "dark" you are, then you have to have drawn a line somewhere, based on something."
Post 119
I couldn't find any declarative statements of your intent inasking the question here.
Post 121
"In the absence of clear demarcations, it is therefore totally acceptable to simply make up any rule and either accept or reject people, based on these rules. Without telling anyone how you made those rules. And the rules can be adjusted to whatever you feel like, whenever you feel like it, depending on each person."
Now, in post 121, it seems like you aren't actually advocating that we make up completely arbitrary rules but are in fact stating that such a position is the logical extension of the standards you believe others are advocating in this thread. But I could be wrong, as I find your writing style excessively vague.
As for the other posts, it seems you want to discuss racial preferences and affirmative action and how people determine whether someone fits a classification. Is this accurate? I have to admit that having read the posts you referenced I'm still very unclear what you think this thread is going to accomplish by way of discussion.
It seems you actually do have a thesis:
Racial classifications, such as used in quotas, affirmative action, racial preferences or the express racial discrimination of the Jim Crow days suffer from a problem of definition as it is impossibly to clearly define one race from another.
Is this a rough approximation of your point?
Because if it is, it is my impression that most people have thought you were making a totally different point, which I would restate as follows:
"Race" simply doesn't exist because it is impossibly to classify everybody as one race or another. Some people have such vague racial features (whatever those may be) that to say anybody is of a race would be fallacious. Ergo, race is a myth.
All the people who have been citing studies have been responding to the latter point... that race isn't a myth, even though the lines between races is very fuzzy. I don't think anybody has been responding to the intial point because I don't think anybody was ever very clear that was your point at all. I certainly wasn't and frankly, I'm still not sure that was your point.