Respectfully I disagree or at best it depends on the racist. A lot of racists like their black conservatives sympathetic to their causes but they have more respect for a black conservative that marries black as it displays (to them) a degree of integrity and shows that they just want the best for their respective community and aren't just trying to "tether" onto white communities. That's not even getting into the fact that a lot are still bothered by interracial dating especially black men with white (and asian) women.
Weirdly enough the only time I've seen racists get bothered by intraracial relationships is with asian women dating asian men.
It depends on the degree of racist as you correctly pointed out..these people are weird, dont forget that.
As much as they generally hate the seeing the sight of a Black man with their priceless White woman, they can confuse you.
The same racist will later that day scour the mall and hire brehs to smash their wives for them, and some have have fantasies about brehs breaking their daughters virginity from what I've heard..
Also, calculating Tim wouldn't have pulled a White woman if he thought his Southern White voting base would be offended..but some negroes are so dedicated and invested to the White cause you couldn't tell them nothing.