ok is there actually a good argument for "race is a lie" or have I been straining my brain trying to understand this in vain?
Like, they say there's no racial categories, but... i got a DNA test which puts me into clear categories...
Who's saying it and what do they mean?
I said something similar in college when I realised I had more in common with the (American) black students than my (Russian) TA, despite the fact that we were both "white".
Fair.
How you group people is... not arbitrary, but a matter of choice. Different groupings reveal different similarities and differences.
No grouping is more true than any other, but some may be more useful.
Statistics. Men are taller than women, but the tallest women are taller than 99.999% of men. True for every axis of distinction between groups. A Black American is likely to have many more genes in common with a Scot than a Ghanian.