For one thing, he promised to revisit and revoke Roe vs Wade. He said he would find a supreme court judge to get it done.

This is a very regressive move, and if you don't understand what it is, or why it is, you don't understand why women marched in such numbers.

He also strongly advocates protectionism. That is so injurious to lower and middle-class Americans  (and beneficial to his wealthy fellow billionaires!) that it should never be allowed to see the light of day.

He uses fear, lies, bullying and deception to achieve his goals. So it's not just what he does, but how he does it that people don't like. They don't just want Trump to stop using his wealth and power to stop grabbing women by the pu$$y, but he's grabbing America by the private parts and they want him to stop right now.

They want him to show respect, speak plainly and honestly, think rationally, and act responsibly. They want Trump to be a president, not an embarrassing and dangerous village idiot.