You are able to research this matter of people coming up with a variety of pronouns, as well as the variety of genders people now claim.We each have the right to define ourselves. I know many transpeople; I don't know any who want a variety of pronouns. Most just want the standard pronoun for the gender they identify with.
You also don't know any teenagers who identify as bi, trans and gender neutral, either. Are you saying that therefore such teens don't exist and you don't have to consider them as existing?