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Lauryn Hill, had the nerve to snap at a fan for being disrespectful despite the fact SHE was severely late for her own show.

Hill played the House of Blues in Chicago last week, and was supposed to start playing at 10:30 — but didn’t actually make it  to the stage until 11:20.

Once she did, most concert goers say Lauryn’s opening song performance was terrible, and when a fan called her out and flipped her off … she berated him and had him tossed out by security.

The person who shot this video told TMZ they decided to leave after 2 more songs (which they called “rushed and sloppy”) … and say they saw a huge line of people at the box office asking for a refund.