“Wow, you actually agree with this ruling? So U.S congressional districts should also be redrawn along racial lines?”
That’s not what he’s saying at all. But if, say, Maryland decided that all 8 of its U.S. Representatives would be elected at-large, the 70%-white statewide electorate would elect 8 white Democrats. Such a system would not allow the black majority of voters in Baltimore and in Prince George’s County from electing the candidate of their choice, which would violate not only the Voting Rights Act but also arguably the 14th and 15th Amendments (in addition, it would violate the principle of one-man, one-vote, since a 55% Democrat majority would cast 8 votes for Democrats, leaving the 45% Republican minority with no chance to elect a representative). Similarly, assuming that Hispanics in that town in NY are concentrated in a particular area, the decision to elect councilmen at-large instead of by district had the obvious effect of denying Hispanic voters the ability to elect one of more councilmen.