When i was car hunting i found it funny, i would find a car worth 5k, the owner wants 8k, i offer 4.5k and sometimes they would cut sick at me for trying to undercut them, but then get mega defensive when i would accuse them of over pricing.
Actually, fairly hilarious is when someone offers a car for 5k or nearest offer, so ill offer 4.7k and they go batsh*t for offering them a price. I mean they did say "or nearest offer", and 4.7k is pretty near, but the way most sellers i met reacted you would swear you smacked their childs pet with a shovel in front of them.
In the end you just walk away and if they are desperate to sell then you will hear back, if they arent desperate to sell then you move on. Cars for sale are like women and buses, theres always another one coming around the corner.