A British friend said something snooty to me Wednesday night at the U.S. Open.

“Ugh, this is so American.”

A concert fog machine had just turned on as World No. 2 Carlos Alcaraz walked into Arthur Ashe Stadium, like he was Lady Gaga at MSG.

Once the match started, the 23,000 spectators talked the entire time. 4

“Please try to keep your voices down,” the Serbian chair umpire repeatedly implored in an exasperated tone that suggested these are her two least favorite weeks of the year.

The New York crowd couldn’t care less and kept yapping away regardless.

And, with seating rules mercifully loosened, folks got up to go buy cocktails right in the middle of points — stacking as many $23 vodka-lemonade Honey Deuce cups as Novak Djokovic has trophies. Why not? Spaniard Alcaraz was crui

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