Prior research has shown that less favourable first impressions are formed of autistic adults by non‐autistic observers. Autistic females may present differently to autistic males and could engage in more camouflaging behaviours, which could affect these first impressions. However, research has not yet tested for gender differences in the first impressions of autistic adults. In the current study, non‐autistic observers (n = 205) viewed either 10‐sec video clips or text transcripts in the context of a mock job interview by 10 autistic females and 10 autistic males, matched to 10 non‐autistic females and 10 non‐autistic males. They then rated each stimulus on personality traits (e.g., awkwardness) and behavioural intentions (e.g., “I would start a conversation with this person”). Non‐autistic observers were blind to diagnostic status of the individuals in either modality. Results showed that first impressions were less favourable overall of autistic adults in the video modality. Furthermore, autistic females were rated more favourably than autistic males in the video modality across most traits—but autistic females were also rated less favourably than both non‐autistic females and males. Some judgements were also made in the text modality, whereby more favourable first impressions were made of autistic males on the basis of speech content. Understanding the first impressions that both autistic females and males make has important implications for diagnostic services and employment prospects. Autism Res 2019, 12: 1495–1504. � 2019 International Society for Autism Research, Wiley Periodicals, Inc.

We found that non‐autistic people formed more negative first impressions of autistic people, and this was influenced by gender of the person being evaluated. Autistic women were judged more favourably than autistic men; however, both autistic women and men were rated less positively than non‐autistic people, with large differences between judgements of autistic females in comparison to non‐autistic females. The findings have implications for clinicians and employers who may make rapid judgements based on someone's gender.