When a black man (or woman. It happens with both.) uses negative experiences with their race to justify attraction to non-blacks and/or exclusion of their own. Stereotypes are also be used for this.
"One black girl called me an oreo in high school so I now I only date Latinas"
"I don't date black guys because I'm not interested in baby mama drama"
Black Scientists: "These poor people are suffering the (ughhh ughhh) phenomena of The Glover Effect! Only extensive therapy can save them now."