are generally describing the whole phenomenon as a series of isolated incidents, there have definitely been than you would expect upon hearing that description. French media has reported 12 or so separate incidents. Some theaters have even removed the film from their screening rotation entirely. At least three theaters in Germany have all reported full-on brawls breaking out during screenings of the film.
At Mégarama in St. Etienne, the fight became so widespread and aggressive that a security guard ended up with a head injury. Bottles, cans, and punches were thrown. That very same day, viral footage of a huge brawl was captured at Kinepolis in Thionville. Police showed up and forced around 500 people out of the cinema.