It's an odd accusation as I don't even hate Trump. I find him ridiculous but I don't hate him. I hated Bush and still do because he is a war criminal up to his armpits in the blood of innocents. Trump, not yet.
So how do you feel about Obama and Hillary, who armed and trained and promised support to the Islamists inside Syria and therefore enabled a particularly bloody civil war?
Boom, Trump started as a pretty dislikable person. Even as billionaires go, he seems petty and overly ostentatious. As a businessman, he seems particularly vindictive and again, petty, with particular skills in doing deals with largely his profit and largely others' risk. As a man, he has consistently valued women only (or at least personally) primarily as ornaments and sex objects. As a political figure, he has consistently leaned toward the emotional, brainless demographic (a tactic more commonly seen on the left.) As a celebrity, he has consistently been petty and, well, tacky, a reality TV personality similar to Billionaire Boo Boo and "professional" wrestling. (But I repeat myself.) The reasons cited are certainly valid, but only icing on the cake.
I hope the guy turns out to be an excellent President, but there are plenty of more legitimate reasons to dislike him.