Can Someone Explain This To Me?

Perhaps someone can explain this to me: Why is it

• racist that the voters of one candidate's race prefer that candidate by a 3:2 margin, but

• not racist that the voters of another candidate's race prefer that candidate by a 10:1 (or 17:1) margin

It seems to me this comparison is the reflection of clear partisanship and/or racism on the part of the reporters, editors, and publishers pushing it.