But those men and boys do not want to live as women / girls 24/7. That's why we have this thing called "real life test" in transgender treatment. Those men / boys will find it quite stressful to live full time as women / girls.
For example, this guy likes dressing up as Disney Princesses. I don't think he is interested in living as a woman. He is not a trans woman. He just likes dress up.
And no one is telling trans kids they are in the wrong body. THEY are telling adults how they are feeling inside. They want to transition, not their parents, not their doctors or any other adults. You might feel more comfortable in your alternative reality, but you should not spread lies about children just to make yourself more comfortable.