The fact that you admit to being a bad judge of character in the past should give you pause to reflect on the possibility that you are still a bad judge of character today.
Why did you have a "neutral to positive" impression of a "childish ass and a narcissistic sociopathic inept moron"? Is it possible that you are just repeating whatever you hear from the media? And now they have decided that he should be hated?
Also, interesting that you mention Donald Trump because my opinion of Donald Trump has not changed over the past 15 years. I always thought he was a selfish conman. So is my judgment better than NBC who paid him millions and is it also better than the Clintons who went to his wedding?