Easy: Al Sharpton. Always have disliked him.
However, if you had included Ann Coulter, George Will and Rush Limbaugh, hell would freeze over from disgust. Compared to those three, Al Sharpton is an angel and not at all annoying.
Do people realize that Al Sharpton is a rabid anti-semite? The man has used the media, including his own media platforms, to incite violence against the Jewish community. He quite literally recreated Kristal Nacht on the streets of New York, and quite a few hate-crimes and murders have resulted from the lynch mobs he organized. In the most notorious incident, one of his lieutenants burned down a Jewish business with the owners and himself inside because they evicted a black tenant to expand their business.
The man is practically a bonafide Nazi.
In addition to Bedstuy rightfully mentioning the Kristal Nacht and Crown Heights comparison being bunk, he wasn't alone in the Crown Heights riot. David Dinkins had supported a radical culture amoungst the NYC ghetto population, so Sharpton, in an otherwise moderately bad influence, gave the spark that light the Black Panther gasoline that was Dinkins' New York.