Go ahead... fortunately, there are two sides, and I am on the side that acts like the typical BU.
oh yes, and of course your side has no contractors or suppliers. (Warning: Irony) What are you even talking about? Besides, no one says that the BU is "mean." That is completely normal business conduct. This also includes going into negotiations with a payment plan first.
I certainly don’t believe every builder has sufficient negotiation skills, but primarily, what is usually missing is the willingness to negotiate. Many home builders I know didn’t even address the topic before signing.