Broker playing mind game with me?

[Charlotte Dunford]

Have you ever been under contract, and doing your due diligence, and you find a bunch of problems. You ask for a concession, but the seller's broker keeps telling you that they don't really care if you back out because they have a waiting list of buyers. They tell me the problems I find are not things experienced investors would find as problems. Are they just playing with my mind and trying to make me doubt myself? Thoughts? What other tricks do brokers play on your mind?