I imagine it may not be that simple, given the segregation of ethnic populations. I.e., people probably interact more frequently and closely with others of the same ethnicity, so the average effectiveness may not be sufficient.
Ah fuck it; nuking my account. I shouldn't waste time here arguing with people.
It's like going to the gym, but it prepares you to have face-to-face discussions with real-world people whose opinions you actually care about, rather than strangers on the internet.
I've been downvoted, and disagreed with many times, but I can't say I didn't learn something new each time, even if it was about something as basic as the way I phrase comments.
Cheer up, maybe you were completely right, and other people just didn't quite get what you were saying!