The reason why liberals are so mad about trump is because of two factors:
1) They used their usual bag of tricks on him and not only did it not hurt him, but it helped him. They called him racist for eating a taco bowl or because of mexican judge comments. They called him xenophobic because of the wall. They called him a sexist because of grabbing pussy. Yet in spite of being the most racist and offenthive president eva...trump won more hispanics than romney. He won a majority of white women. Liberals thought it was just as easy as screaming their *isms and america would fall into place. Nope. That has to be incredibly frustrating for liberals. "B-b-b-but he's a raayyyyycist he's a sexxxxistttt he's meaaaaaan he hurts my feeeeelings"
2) Liberals tried to make the election about defining what America is. They said trump does not represent our America. They said, think of the children and what they would think. They said "that's no who we are" The problem with setting up that kind of dialogue is that when you lose, it's one gigantic bitch slap across the face. You made the election about who we are, and the guy that you said who we weren't ended up winning. Then you contrast that with Crooked Clinton trying to break the glass ceiling because she is a powerful woman that wants to roar and it's all the more dreadful for them. It was HER TURN!
If they stayed away from that narrative trump would have been easier to swallow.
3) *bonus number* Liberals are pussy crybabies and they have NEVER lost an election with grace in the modern era. They are solipsists and think the whole world and all of culture revolves around them and agrees with them. This is because they have culture privilege. They grow up where all their role models/actors/sports figures/musicians/teachers/art agree with their worldview, it's constantly reinforced. Liberals are seldom exposed to other viewpoints, whereas conservatives grow up in a country constantly telling them how they are wrong, stupid, retarded, evil. Conservatives aren't surprised when they lose an election because they know not everyone thinks like them. This is not the case for a liberal. As such whenever a liberal loses, their worldview gets shattered it really fucks them up psychologically. Yes, it's fully possible to have a president that grabs pussy. No, you shouting racist isn't an auto-conservation-ender. Yes, your friend juan is gonna have to go back to Guatemala. Nope, you can't keep taking peoples money.