Yes, they are. In fact, one of the reasons we had the groups in the schools was that the students felt isolated. There's subtle bullying and racism. You'll see that there isn't a lot of mixing. The students felt isolated. For example, at one school we have a group of largely Nepali-speaking girls. Because of their limited English, teachers couldn't even communicate well with them. So they had nobody to listen to them, nobody to bring issues to.
On May 30th, 2012. See this statement in context.