Olympic gold medalist Sage Kotsenburg is the toast of New York.

The laid-back, slopestyle snowboarding champ was seen Wednesday at the Standard Grill, where he got a rousing, patriotic reception from downtown diners.

“When Sage was leaving, the entire restaurant stood up and gave him a standing ovation, then started chanting, ‘USA! USA!’ ” said a spy.

A source added that on his first visit to town, Kotsenburg was put up in a W Times Square penthouse that “looked like the inside of the New Year’s Eve ball, complete with a round bed.”