This. He either does not know, or doesn't care, that negotiations of this sort are supposed to produce win-win outcomes. He only wants win-loss outcomes, with him as the winner.

That may work fine when you're trying to bully someone to pay more for your name on their product in a licensing request where you hold all the cards, but Trump either doesn't know or doesn't care that there are co-equal branches of government in America.

The way I interpreted his tweet of the situation is that he asked, as a starting negotiating position, that if he allowed the government to reopen, that he would get his wall funding within 30 days. Nancy Pelosi said "No" and that is consistent with the Democrats position of saying we can debate border security separately from re-opening the government.

He still wanted an assurance that he'd get his wall if he reopened the government as an opening position, and the opening response was a reasonable "No". He then just left, which means no one's able to negotiate towards a compromise or solution.

He's basically painting himself (probably purposefully) into a corner where he "has no choice" but to use Emergency Powers, and then we are in a real world of hurt as a democracy.