Doctors have branded April 16's Supreme Court ruling "scientifically illiterate" in a major rebellion against the "common-sense" judgment.
The British Medical Association's resident doctors voted to "condemn" the ruling - which confirmed that trans women were not legally women.
At a conference on Saturday, 50,000 doctors passed a motion criticising it as "biologically nonsensical" and claimed it was made "without consulting relevant experts and stakeholders".
The doctors also claimed a binary divide between sex and gender "has no basis in science or medicine while being actively harmful to transgender and gender-diverse people".
The doctors claimed a binary divide between sex and gender 'has no basis in science or medicine'
GETTYThey said: "We recognise as doctors that sex and gender are complex and multifaceted aspects of the human condition."
Elsewhere in their motion, they added that attempting to impose a "binary" setup is "actively harmful to transgender and gender-diverse people".
And they pushed the BMA to "affirming the rights of transgender and non-binary individuals to live their lives with dignity, having their identity respected".
The Supreme Court ruling clarified what was meant by the term women in the 2010 Equality Act - and the judgment means transgender women can be excluded from women-only spaces.
The stance taken by the resident doctors raises the prospect of the medical profession seeking to obstruct ongoing NHS plans to draw up new single-sex space guidance.
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Trans rights protesters pictured demonstrating in Edinburgh following the Supreme Court ruling
PA
This follows the union's decision last summer to reject the Cass Review and call for an end to the ban on puberty blockers for children identifying as transgender.
And it has sparked fury from Helen Joyce, the director of advocacy at gender-critical group Sex Matters.
She told The Times: "It's terrifying that a group of young doctors, all of whom have been through several years of advanced education and training in biology, have been indoctrinated by trans activism."
Joyce called the junior doctors "an embarrassment to their profession" and said they "wildly misunderstand the role of the Supreme Court."
Helen Joyce (left) and Maya Forstater pictured celebrating the Supreme Court ruling
PA
"What next: young geographers claiming that the Earth is flat, or junior vets who think it's bigoted to suggest that cats can't identify as dogs?" she blasted.
A BMA spokesman said in response: "Attendees at the BMA's resident doctor conference voted to show their opposition to the Supreme Court ruling on Saturday."
However, they clarified that "BMA-wide policy is set at the annual representative meeting, with the next meeting coming in June."
"The BMA respects trans patients' dignity, autonomy, and human rights" and "continues to believe that trans doctors, NHS workers and patients deserve dignity, safety and equitable access to healthcare and healthcare facilities."
