I suspect some Republicans view Obama this way: they don’t like his policies, but they can’t help but admire his professionalism.
Some Questions for Paul Ryan as He Tries to Sleep
John August
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Or they hate him because he’s black black black black.

From TN-C Coates
 Racism greeted Obama in both his primary and general-election campaigns in 2008. Photos were circulated of him in Somali garb. Rush Limbaugh dubbed him “Barack the Magic Negro.” Roger Stone, who would go on to advise the Trump campaign, claimed that Michelle Obama could be heard on tape yelling “Whitey.” Detractors circulated emails claiming that the future first lady had written a racist senior thesis while at Princeton. A fifth of all West Virginia Democratic-primary voters in 2008 openly admitted that race had influenced their vote. Hillary Clinton trounced him 67 to 26 percent…
https://www.theatlantic.com/magazine/archive/2017/01/my-president-was-black/508793/