Hated is such a strong word. Now if you go to question 100, Trump's likability you'll see it was broken down into like a lot, like somewhat, neither like nor dislike, dislike somewhat and dislike a lot. Perhaps dislike a lot could be equated to hate and like a lot to love as it seems for most, they either love Trump or hate Trump.
https://docs.cdn.yougov.com/5fsvmrvvhh/econTabReport.pdf
Now as you can see, Democrats really dislike Trump a lot, Republicans like him a lot. So that is basically based on the letter behind Trump's name. but what about independent? the non-affiliated, less to non-partisans. Only 13% like Trump a lot, add the 12% who like him somewhat you have a total of 25% of like Trump. Now you have 33% of independents who dislike him a lot along with 13% who dislike him somewhat for a total of 46% of independents who dislike Trump. 20% answered they neither like nor dislike Trump.
I concentrated on independents here as Democrats disliking Trump is to be expected as Republicans liking him is. So why do independents dislike Trump so much? If you check out his policies and his stances on the issues, independents are fairly split on those, for some, against some and don't care on others. So one would normally expect more of a 50-50 split on the like/don't like scale instead of a 25/46 like/dislike. Why?
I think this has more to do with Trump himself than his policies or even his politics. His very unpresidential behavior, his childish antics, his temper tantrums, his name calling, his bullying. One doesn't expect these things out of the president of the United States. I'd say with independents, swing voters if you will, the non-affiliated, it's his uncouth, obnoxious personality. I personally think that it will be Trump's in your face, bullying persona that will defeat him in November much more than his policies or what he has done as presidents or even his politics.
Independents voted for Trump in 2016 by a 46-42 margin over Hillary with 12% voting third party against both major party candidates. I think independents this time around as in the 2018 midterms will go for the Democrat. Because of Trump himself and his rude, childish, unpresidential behavior. These folks actually expect a president to act presidential, you'll see.