Caveat: This is my personal opinion, based on my observations of interactions between people with strong partisan preferences. It is not a statement of fact, nor should it be interpreted to imply any factual basis whatsoever.
In general, it has seemed to me that the traditional "left" has gained a lot of power by controlling the message and the narrative. They seem to anchor how the discussion takes place, and to additionally rub a significant amount of appeal to emotion on top of it. There has been a tendency to mock and ridicule those who disagree with their ideology and their policy suggestions.
It is my opinion that a large amount of the hatred for Trump (not all, by any means) is because he doesn't play by those rules. He doesn't care about the ground rules for discussion that they keep trying to lay out. He doesn't react the way they want him to, and he doesn't follow their lead. He rejects their narrative altogether and is immune to their ridicule. In fact, he responds to the veiled ad-hom of the left with egregious and blatant ad-hom. He doesn't try to defend himself against misleading accusations. In short, he refuses to answer "when will you stop beating your wife"... and instead responds with "you're a jerk" and walks away.
Regardless of whether you agree with my assessment or not, I firmly believe that controlling the narrative is an incredibly powerful tool. And it's one that the left has been very good at wielding in the past. But it only works as long as the opponent accepts the framework for that narrative. In the past, it hasn't always been the democrats that have taken this approach. Not that long ago, it was the republican party controlling the discussion, controlling the interpretation of discourse, and consequently pushing forth equal rights for black people.
The one who controls the discussion controls the belief. The left has lost control of the discussion at present, and Trump has established his own rules. They aren't good rules, but they're effective.
I suggest you try changing your approach so you can get back on top of the narrative here.