candukid
Whether they like it or not, he is our President for the next three years.
And it's worth noting that he was elected, in due part, because he wasn't the standard, run-of-the-mill polished politician who's gifted in covering up lies and saying one thing and doing another. If nothing else - the democrats know exactly where Trump stands on issues. He's not gonna flip-flop just to suit the party he represents.
He's pissed off as many people in his own party as he has those from the other side. Which, again, is primarily why he was elected to begin with.
So to answer your question - if you're a democrat - you soothe his ego. You find common ground, figure out where there's room to work, room to persuade, room to perhaps influence the perception that you're not completely against everything he "supposedly" stands for. You find out where he's willing to compromise and negotiate. And sometimes there's nothing there worth compromising. But in certain areas - there are.
And it's been this way with every US President since the inception of our nation.
It might seem like something completely unique to our political system given who has been elected, but the same premise holds true. He can certainly be influenced, but the opposing side seems bound and determined to "do what the republicans did to Obama" from 2012-2016 with the stonewalling and what have you.
Again, this gets us nowhere. Compromise is the only way forward.