Transgender people exist as transgender only within gender ideology. Outside of gender ideology, they exist as people who have a form of body dysmorphia called "gender dysphoria (already poorly-named)," which means they do not feel as though the sex of their body matches the sex of their mind.
What you (and everyone else screeching about existence) are ultimately screeching about is that not everyone buys into your idiotic, toxic, and harmful ideology. People with body dysmorphia need help, and assuaging their delusions isn't it. You're harming them, and you're stochastically creating the illness in others, especially children. That's why public school teachers shouldn't be allowed near children.