Based on the data from PISA 2018, the study investigates the relationship between gender and immigration status on exposure and attitudes towards bullying and students' perception of teachers' intercultural attitudes in Spanish high schools. While boys and first-generation immigrants experience significantly more bullying, girls and students without immigration background showed overall stronger negative attitudes towards bullying. Finally, boys and children with an immigration background perceived higher degrees of teachers' cultural biases. These findings provide new insights into the importance of addressing gender and ethnic biases in anti-bullying programmes.