Duffield has expressed an array of anti-trans views, such as demanding a ban on those who self-identify as trans entering the likes of “DV refuges, women’s prisons, single-sex wards and school toilets.” In September 2021, the MP for Canterbury wrote a Twitter thread on the topic and called trans women “male-bodied biological men”. “I also have feminist and gender critical beliefs which mean that whilst I’ve always fully supported the rights of all trans people to live freely as they choose, I do not accept self-ID as a passport for male-bodied biological men to enter protected spaces for biological women,” Duffield wrote in one of the thread’s 10 tweets.