Lindsay Lohan - I'm No 'Gypsy' Puncher

but she did call her the g-word ... because the fortune teller's buddies tried to steal Lindsay's purse.  Lindsay's telling friends ... Tiffany Mitchell approached her inside the club Avenue early Thursday morning to do a reading, but Lindsay turned her down -- then noticed Tiffany's friends crowding around her purse at a nearby table.  When Lindsay returned to her table, the people in Lindsay's group informed her that Tiffany's friends had swiped the purse -- so Lindsay angrily confronted the fortune teller.  Lindsay has admitted calling Tiffany a "gypsy" but says she did not know the word is considered a slur.  As for hitting Tiffany -- Lindsay's totally denying that ... and feels she's the victim of yet another setup.