So in an American school, wearing a shirt with an American flag

'could be incendiary', but
More than 100 students were spotted wearing red, white and green as they were leaving school. Some had the Mexican flag painted on their faces or on their arms.
isn't a problem.
The Morgan Hill Unified School District issued this statement: "In an attempt to foster a spirit of cultural awareness and maintain a safe and supportive school environment, the Live Oak High School administration took certain actions earlier today. The district does not concur with the Live Oak High School administration's interpretation of either board or district policy related to these actions."
Just effing wonderful, the 'cultural awareness' crap, isn't it?
... Rodriguez did not want any fights to break out among Mexican-American students and those wearing American flags.
Apparently a lot of the little bastards are more interested in being Mexican than American.