TAIPEI — Mammoth Taiwanese contract electronics maker Foxconn is at it again. This time, over 2,000 workers rioted in one of its town-sized plants in Taiyuan, the capital of northern pollution-soaked Shanxi province. Chinese media reported the riot occurred Sunday evening after Foxconn security guards savagely beat one of the factory’s workers. The beating sparked an angry response from a section of the 79,000-plus employees the Taipei-based company hires to churn out parts for Apple’s new iPhone 5, along with other products for Dell, Nintendo and Nokia.