What is hiding behind the rainbow plot? The gender ideology and LGBTQ+ lobby conspiracies (GILC) scale.

Previous literature on conspiracy beliefs has an important gap, as it has almost completely excluded conspiracy beliefs relating to LGBTQ+ people. The purpose of the present research was to develop and validate a specific tool to measure the Gender Ideology and LGBTQ+ Lobby Conspiracies Beliefs: the GILC scale. Two independent data collections (N tot  = 1.908) were run involving both heterosexual and gay, lesbian and bisexual people. We expected a mono-factorial structure of the tool, with high levels of internal reliability, invariant by respondents' gender, sexual orientation and previous knowledge or hearsay of gender ideology. Furthermore, we expected that GILC scale manages to measure a differentiated construct: (a) compared to other specific and general conspiracy contents; (b) compared to a generic disposition to engage in conspiratorial mentality; (c) compared to existing measures of sexual prejudice, stereotypes and negative attitudes towards sexual minority people. In relation to criterion validity, we expected that several psychosocial and socio-political ideology variables (i.e. RWA and SDO), would associate with high levels in GILC scale. The results confirmed our expectations, showing that GILC scale is a short tool which include nine items with a mono-factorial structure and with excellent psychometric properties. Limitations and further research directions are discussed.