"Differences in groups are real" doesn't mean anything, everyone agrees that differences between groups is a thing, that is the entire purpose of groupings, what you've failed to prove is that racial groupings represent anything other than "what the eyes see". The bottom line is that it doesn't matter what your eyes tell you because "eyes" are not a sufficient tool for genetic analysis, otherwise something like a paternity test would never be necessary because it would be apparent by looking at a father and child that they are directly related. Your eyes provide a crude signal for some genetic traits, not a definitive description. Your reasoning is akin to sorting boxes into groups based on their weight and then suggesting that weight classes are sufficient to describe the content of boxes because years of analysis based on weight has yielded statistical trends about particular weight class groupings.