I have found that in general, kids in Korea are rude and obnoxious. Especially in english schools where they know that mum and dad are paying for them to be there so we gotta kiss their ## basically. Adults dont call you racist names etc.. which I have had children do to me.
Try this URL for blacklisted schools. Keep in mind though that directors change and schools go through changes http://hagwonblacklist.tripod.com/list.html
See ya
PJ