It could also mean that those men simply aren't sorting potential female mates by race, and are considering a litany of other discriminating factors that are more important to them. Those other factors then generate the results that we see.
Like I said, if you're trying to date a black woman at an anime convention, you're going to have very limited success. If you want to date any woman who is interested in anime, she's likely going to be white.
It could also mean that those men simply aren't sorting potential female mates by race, and are considering a litany of other discriminating factors that are more important to them. Those other factors then generate the results that we see.
Like I said, if you're trying to date a black woman at an anime convention, you're going to have very limited success. If you want to date any woman who is interested in anime, she's likely going to be white.