Can I not claim to be a different age? Who is anyone to tell me I'm 10 years old and am not allowed drive a car to go purchase alcohol and cigarettes.
Why not claim I identify as a citizen of any country I wish? Who is anyone to question that?
Can I not claim to be a different species? On Mondays I wish to be a sloth.
Can I not claim to be Emperor and demand everyone bow to me?
While I'm at it, I'll order the waves of the ocean to cease.