Hailey Hatch et al. (2022) conducted a systematic review and meta-analysis of predictors of transphobia. The final analysis consisted of 82 studies with a total of 36,285 participants. Main findings in the table below. A higher score indicates more transphobia. Right wing authoritarianism (RWA) is one of the strongest predictors, “characterized by the tendency to submit to authority figures, to adhere to conventional social norms, and to aggress against those who may be considered threatening or perceived to go against conventional norms”.
Hatch, H. A., Warner, R. H., Broussard, K. A., & Harton, H. C. (2022). Predictors of Transgender Prejudice: A Meta-Analysis. Sex Roles, 87(11–12), 583–602. [Unpaywalled]