In 1985, a supergroup of singers got together and recorded the song, "We Are The World". On the first night of recording, the musicians were greeted by a sign pinned to the door which read, "Please check your egos at the door".
Ego is counter-productive. Forget ego. It gets in the way. We are all working together to try and make this thing better. Everyone's got their ideas of what's the BEST way of doing things. Quite often, there is no one right answer either. So regardless if you're a business partner, or a temp worker making minimum wage, park your ego. Decision making shouldn't be about whether or not it bruises someone's ego. It should be about what makes the best sense for the situation and for the brand / company / organisation you're trying to build. There's no reason nor need to take offense to any business decisions made. This is something that even team leaders need to make note of too. No decision should ever be made, "because I said so".
Yes, there are times when you'll disagree and yes, you might have to concede to whomever is in charge, but at the very least, they should be able to tell you their reasoning and not because it's how they feel.
Ego is counter-productive. Please check your egos at the door.