One thing observing on TV each night the politics of the season, without picking any sides, or putting out any opinion is what I call
Do Not Be An Adult Sitting In The Principal's Office.
In looking at this in terms of REAL ESTATE, think we are ALL EQUALS. It can NOT feel like that at times with one agent trying to bully another in a negotiation. Or a SELLER on one side trying to bully a buyer's agent with HIS or HER lofty and oftentimes unrealistic assessment of their home's value or proposed terms.
At least from the agent, be professional, be a fighter, be an equal, be respectful, civil, BUT FIRM in your representation. Do not be so nice, you get rolled over BY ANYONE.
Push back may open some eyes on the other side, but you are not a child. KEEP all interactions ADULT to ADULT and don't leave that stance. A lot of this takes "self-confidence" NOT arrogance on your part, even if you are feeling a ton of arrogance and haughtiness coming from the other side. YOUR level head will always win out in the end with respect. It can be shocking in a negotiation what you see from the other side, but don't let it bother you, just KNOW WHO YOU ARE. AND you are NOT an adult at the Principal's office.