Ok so you've heard all the negative stuff. I doubt you know too much about his success stories. If you allowed yourself access to people who have good things to say about Trump instead of only listening to people who talk negatively about him, you may still have am overall negative opinion of him (which is completely fine) but you most certainly wouldn't have the bitter disdain for him that you have. That's how it works. Just completely flood the news with negative stories and over time, you will change perception of a person. Like I've said before, the legacy media made Trump killing the ISIS leader a negative story for Pete's sake. It's just negative negative negative until you have people saying "I don't need to hear what he says. I already know he's a terrible person."
I'm not saying they're tricking people into thinking a great person is a terrible person (although that would also be easy to accomplish for the legacy media). I'm just saying 100% negativity is clearly going to change perception of someone for the worse. Even if that means changing someone from really bad to Hitler. I'll say it one more time so hopefully it sinks in. They made a negative story out of killing the ISIS leader. That's really messed up.
I think the media has done a terrible job covering Trump. As our news model has changed to more click-based, all outlets saw him as a goldmine. Anything Trump-related, especially something designed to stoke outrage, is automatic huge engagement. So, everyday they took the most innocuous things (stuff that was out of the ordinary, but not necessarily bad) and ran stories that made it seem like the sky was falling. This constant barrage of, "Trump bad!" understandably turned people off and made them distrustful of the media. And then when Trump actually did things that were quite bad, the media had lost credibility and it could not convince people that this dude is actually proposing some very anti-democratic and unconstitutional things.