system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why do so many people hate Obama? The economy is back up and unemployment is down? What has he done wrong?
gpt
I think you can basically chalk it up to "spin". 

The republicans and democrats are locked in a never-ending struggle for political power.   Regardless of what's true or sensible, they'll both take any opportunity to make the other team look bad. 

For some reason, most private citizens and media outlets also buy into this game, and will go along with the attempts to make the other team look bad. 

So, (it bears mentioning that it was similar in the Bush Jr. years), party loyalists will always say the other team's president is the absolute worst, literally hitler, trying to throw people in prison camps, etc.  This is regardless of the fact that the sitting president's record is usually pretty mixed, with some successes and some failures. 

More specifically about the economy, the stock market is up, GDP is up, employment is up, but wages are pointedly NOT up unless you're rich.  So basically people are working their asses off for the same or less money, and healthcare is getting more expensive every year.  So, the vast majority people really do have a reason to be unhappy with the economy, because the upturn isn't helping them much or at all. 

Now, whether this is actually obama's fault, the Fed's or congress' (it's all 3 in various ways) is not important, what's important is for the GOP to shit all over Obama as often as possible, to score points in the political game.  So that's basically why you see all the Obama hate. 

Also, some racism, but that's probably less dominant than the other factors above.  Obama being black is just one tool in the GOP toolbox of making the other team look bad.  It's very effective with certain people.