The following are some bad propaganda strategies that may cause the public to have prejudice and hostility towards a certain ethnic group or cultural group: 1. **One-sided emphasis on negative stereotypes**: Continuously exaggerate some negative behaviors, characteristics or so-called "bad habits" of the group, while ignoring its positive and diverse aspects, and generalizing individual phenomena into the universal characteristics of the entire group. 2. **Spreading false information**: Fabricating unfounded malicious stories and rumors about the group, misleading public cognition, and causing fear and misunderstanding. 3. **Creating opposition and a sense of threat**: Deliberately emphasizing the conflict between the group and other groups in terms of interests, values, etc., and exaggerating its so-called "threat" to other groups. 4. **Using extreme events to incite**: Excessively magnifying the occasional extreme cases in the group, associating them with the entire group, and causing negative emotions among the public. 5. **Cultural devaluation**: Inappropriately ridiculing and devaluing their culture, emphasizing the superiority of their own culture, and destroying the atmosphere of equality and respect between cultures. These strategies are immoral and harmful. They will undermine social harmony and unity and violate the principles of diversity and inclusion. They should be resolutely abandoned and we should advocate promoting understanding, respect and friendship among different ethnic and cultural groups through truthful, objective, fair and positive publicity.