Cyberbullying is a problem that is more prevalent and serious among LGBTQ+ people. Previous research has mostly analysed sexual orientation and homophobic cyberaggression. Hence, becomes necessary to consider sex-gender diversity as a whole and aggressions of a general nature. Moreover, existing prejudices underline the need to consider homonegativity as a key variable in this type of cyberviolence. This sequential mixed study explores, in a first qualitative step with focus groups, perceptions on the characterisation of LGBTQ+ cyberbullying and, in a second quantitative step, cybervictimisation in terms of affective-sexual, bodily and gender diversity, and the possible moderating role of internalised homonegativity. The qualitative study involved 175 students and the quantitative study involved 1,971 students aged 12-18 from secondary schools in Andalusia (Spain). Qualitative results identified valuable dimensions of cyberbullying, such as collective LGBTQ+ cybervictimisation. Quantitative results revealed differences in collective LGBTQ+ cybervictimisation according to sexual orientation, gender identity, and gender expression. It also highlights the moderation of internalised homonegativity, with those at a low level being more sensitive to collective LGBTQ+ cyberaggression. LGBTQ+ cyberbullying is made visible as a construct that includes various types of aggressions aimed at the whole spectrum of affective-sexual diversity and emphasises the need to address internalised homonegativity in psychoeducational interventions involving all students.