This poor child didn't express any opinion whatsoever. His parents created a sign and told him to wear it. He'd probably rather be playing with his toy dump truck in a sandbox or splashing in a swimming pool than marching in a parade on a hot day in NYC.
I'm sure a dump truck is too gender specific for his parents. He might(?) have a rubber ball he can play with AFTER he's done reciting passages from "Heather has 2 Mommies".