I know you didn't bring up the Exit fee I added that for information
I don't agree with your conclusions that they bullied us or are being nasty so happy to support their stance.
They came into the negotiations cards on the table saying we need X / Y / Z or we can not do a deal, these are our principles and we will not move on these - Everything else is on the table. At that point we didn't walk away we went into the negotiations, we didn't provide any insight on what we wanted in a similar manner (other than the best deal / have our cake and eat it) because apparently this would weaken our hand and we started to negotiate.
At the outset we could have walked away until they changed their position or enter the negotiations knowing this is the case, we chose the latter. 2 years later The EU seem to have been consistent and flexible within these principles - this seems a decent way to negotiate in my opinion.
This was predicted at the outset that we didn't hold anything to make them change their stance and has proven to be the case (or the Tories are incompetent which adds up to the same thing)
I am not sure why there is anger towards the EU for sticking to something they said they would not change at the outset, once we entered the negotiation table we implicitly accepted their position. Our options were walk away, provide the EU with our own requirements and give them the option to walk away or negotiate within these restrictions.
All IMO.