The Nets are off to a historically bad start.

They’ve allowed 522 points over their first four games, the most in franchise history.

Bad defense isn’t terribly surprising for a Nets team that has the youngest roster in the NBA and is in a second straight season of tanking.

But that doesn’t make it any easier on head coach Jordi Fernández, who is trying to build a winning culture while — at the same time — the franchise looks to give itself the best chance of securing the top pick in next year’s draft.

So it’s left to Fernández — who called the defense “unacceptable” following Monday’s defeat — to sort out the details, like after the Nets gave up a season-high 137 points in Houston on Monday, with a home game on tap against the Hawks on Wednesday in Brooklyn.

“A lot of it is just lac

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