The office [of education] said that it has not renewed their contracts after judging their methods to be inappropriate for teaching students in English.It's certainly the district's or the school's prerogative to retain or dismiss whomever it chooses, and no doubt some native speaker teachers do cause problems or otherwise don't get along with their schools. Some of these reasons are dubious, though:
A written survey was conducted to determine how many acted decently, how faithful they were to their duty, how well they guided students and how well they taught English.
Among the dismissed were those who often yelled at students, argued with Korean teachers assisting them and wore indecent clothes. Some had to visit hospital too often for weight problems and some refused to teach after school, according to the survey.
Well, teaching these after-school classes are not mandatory, although many schools will force or guilt-trip the teacher into teaching them. Those who refuse may, evidentally, find themselves without a second contract.
What has always bugged me about the evaluation process---and I'm not denying that Korean teachers are entitled to a much larger stake in the system and the schools even though they are swapped out every four years---is that native speaker teachers are getting evaluated by all their nominal coteachers, but are not afforded the chance to evaluate them in return. I don't like the idea of some "coteachers" evaluating my classes when they haven't shown up or participated all year, and I don't like that nobody hears about this behavior besides those who read my blog.