Many people on all sides of the political spectrum are against telling kids who don't conform to narrow, rigid regressive sex stereotypes that they are "trans." Many of the people who consider what is being done to many children today in the name of transgenderism to be child abuse of epic proportions are liberal-minded or leftwing people who've always voted Democratic in the US and Labour in the UK. Many of us hew to values traditionally considered "progressive."
Many of us those who challenge the tenets of transgenderism and the new craze for labelling kids as trans are longstanding feminists of the second-wave variety & supporters of lesbian, gay & bisexual rights; this includes many people who are LGB themselves. Lots of us believe that transgenderism is motivated in large part by homophobia: transing little boys & girls is the "woke" way of turning kids whom parents fear might grow up to be gay & lesbian into stereotype-conforming kids whom the parents can pass off as straight.
Many adult transsexuals are adamantly against kids being socially & medically transitioned as well.
All the research clearly shows that nearly 9 out of 10 children who develop "gender dysphoria" in childhood will desist from it by the end of puberty, early adulthood. Many of the rest will desist in their early adult years.
1950s sexism said girls have to wear dresses & play with dolls & other "girl toys." Feminism said girls - and boys - can wear & play with whatever they want. Today's gender theory says anyone who wears dresses, plays with dolls & likes "girly" stuff must be a girl.
Transgenderism is simply old-fashioned sexism that's been turned up a few notches, rebranded as progressive, and given a shiny coat of rainbow paint sprinkled with glitter. But it's still basically lipstick on a pig.