The government hopes that by tackling the early roots of misogyny, it will prevent young men from becoming violent abusers.
But the domestic abuse commissioner for England and Wales, Dame Nicole Jacobs, said the commitments did "not go far enough" to see the number of people experiencing abuse start to fall.
She said while the strategy recognised the scale of the challenge the level of investment "falls seriously short".
Under the new plans, schools will send high-risk students to get extra care and support, including behavioural courses to tackle their prejudice against women and girls.
"Every parent should be able to trust that their daughter is safe at school, online and in her relationships, but too often, toxic ideas are taking hold early and going unchallenged," Prime Minister Sir Keir Starmer said about the new measures.
"This government is stepping in sooner - backing teachers, calling out misogyny, and intervening when warning signs appear to stop harm before it starts."
Safeguarding minister Jess Phillips described violence against women and girls as a "national emergency", adding the government's aim was to be "so ambitious that we change culture".
"All of this is about trying to prevent those behaviours escalating into the terrible figures," she said.
Schools to take part in the teacher training pilot will be chosen next year, while ministers will aim for all secondary schools to teach healthy relationship sessions by the end of this Parliament.
The taxpayer will foot £16m of the bill, while the government says it is working closely with philanthropists and other partners on an innovation fund for the remaining £4m.
The funding covers the three-year spending review period.
Nearly 40% of teenagers in relationships are victims of abuse, domestic abuse charity Reducing the Risk has said.
Online influencers are partly blamed for feeding this, with nearly one in five boys aged 13 to 15 said to hold a positive view of the self-proclaimed misogynist Andrew Tate, according to a YouGov poll.
Schools in England are already required to identify and tackle misogyny and some teachers said schools were already doing the kind of work the measures outlined.
"While we welcome any initiative that prioritises healthy relationships and consent education, it's important to recognise that schools like Beacon Hill Academy in Dudley have been delivering this work effectively for years," Principal Sukhjot Dhami said.
"The challenge isn't starting from scratch: it's ensuring that this £20m is spent wisely and in partnership with schools already leading the way."
Pressed on BBC Radio 4's Today programme on which of the measures were new, Phillips said: "What definitely does not exist yet, [is] if teachers are seeing signs of sexually harmful behaviour or are worried about the attitude of pupils with regard to misogyny… teachers currently don't have anywhere specialist or targeted to send those pupils."
The Department for Education's statutory guidance, external on relationships, sex and health education already says schools should "be alive to issues such as everyday sexism, misogyny, homophobia and gender stereotypes and take positive action to build a culture where these are not tolerated".
It says secondary pupils should be taught about consent, the negative impacts of pornography on sexual relationships, and that sharing and viewing of indecent images of children is a crime.
Updated guidance, external, published this summer and due to be rolled out from September, specifies that pupils "should be equipped to recognise misogyny" as well as its links to violence against women and girls, and understand the importance of challenging it.
Paul Whiteman, general secretary of school leaders' union NAHT, said it was positive the government was recognising the importance of training and support for school staff but said schools were "just part of the solution".
Pepe Di'Iasio, general secretary of the Association of School and College Leaders, welcomed the government's focus, but added it was essential that the government introduced "effective measures to prevent at source the spread of online misogynistic content which is served up to young people by social media algorithms".
Conservative leader Kemi Badenoch suggested the classes for teenage boys were only being rolled out because "some people in Labour" watched Adolescence - the Netflix drama that explored the impact of social media and influencers on teenage boys.
She said £20m was "a pittance" and the government needed to put more police officers on the street, stop "people, who come from cultures that don't respect women, coming into our country", and remove foreign criminals as soon as they commit crimes.
ChemicalPower9020 on December 18th, 2025 at 10:53 UTC »
I feel like this is gonna have the exact opposite effect to what is intended
HugeFanOfBigfoot on December 18th, 2025 at 04:40 UTC »
This is unlikely to build tremendous levels of resentment that backfires in a decade
MeTeakMaf on December 18th, 2025 at 01:17 UTC »
Why are teachers being trained and not PARENTS