Sometimes simply moving locally can take care of a problem. One family in a major city lived first in a neighborhood where the children were being mocked and scorned. But after moving across town family members found that their new neighborhood was friendly and gentle. At times, you may need to return your child to his home culture, or you may need to minister in a completely different culture. It does not depend only on the culture, but on the child.
Some children are far more sensitive than others.
I used to think that my children were almost unique in living for a long term overseas without learning the language. An expatriate teacher told me that he had seen a number of similar cases. It was interesting that he had worked in Egypt, another hostile Muslim culture. Evaluating a troubled child psychologically while on furlough may help determine the impact of a culture. I believe going to a hostile culture is worth the risk.