This can happen when you face problems in a foreign land and are unable to manage solving it rationally. Some knowledge and understanding the culture of your host country and cross-cultural awareness may help. Years ago, I faced some problems with dishonest and tricky employers in China. But it did not make condemn all Chinese in general.

When you combine a disoriented and arrogant ego with an anecdotal understanding of his 'new world', you create an Ex-pat