IDK if this will help, but I hope it will:

It sounds like you were forced into a fight with a manager over whether your opinions, ideas and thoughts were worth hearing - to him.

Although he had an official position, he was not acting with decent authority: so his judgement of your ideas has no force or truth, but is just his.

Your ideas, opinions and thoughts themselves were never at stake. They existed before that manager, and they existed after. They exist now.