Because he won’t give the liars and the propagandist justification for their slanders of being a dictator.
It demonstrates that he compromises and works for all Americans and not just the ones that agree with him.
compromise is one thing, signing a bill that outright aids in destroying the USA is another. That’s not being a dictator to want to be in line with constitution when nancy and the other spoiled children in leadership positions are all about unconstituional matters being made law.