Maybe trans people are tired of having their existence debated or being treated as a problem to solve (often in an unnuanced way that tries to simplify trans people in exactly the ways we are pushing back against).
Yes, seriously. Pick a characteristic and someone out there says it should not exist. I've walked past people with megaphones saying my race should not exist. I've loudly been told my religion should not exist by employers. Having your existence questioned is normal and probably unavoidable whenever humans with different values bump into one another.