A funky Upper West Sider is causing a disco ball inferno on West 86th Street.

Residents are not digging the blinding purple light caused by what they assumed was a disco ball on the ninth floor of the Dexter House hostel between West End Avenue and Riverside Drive.

One even raged that “Disco guy” was causing “light pollution.”

“At night, the light flashes in the windows of all the apartments across the street all night and is extremely disruptive,” one anonymous tipster told West Side Rag.

“We have tried contacting the non-emergency police number, and they said there’s nothing they can do about it because no law is being broken.”

“Disco guy” simply isn’t being groovy to his neighbors, locals said.

“Should we also defend the person upstairs that tap dances from 3am – 5am?” another pe

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