i think neopronouns are completely valid.
saying they’re ridiculous isn’t really a valid point, since i could just say the same thing about binary pronouns -(he/him, she/her, they/them)
pronouns and gender identity are a social construct anyway. who cares if someone wants to be called ‘it’ or ‘zir’? how does that affect anybody in any way? some people seem to think that someone asking you to call them ‘xe’ is the end of the world.