Candice Owens is a crackpot. If she's the best rhetorical card you have to play, you don't have much of an argument. She's a failed Youtuber making a second go of it as a political commenter, by way (literally) of Infowars.

There are serious black conservatives. Tim Scott, for instance. Michael Steele. Crystal Wright, maybe. Find one of them being called a "white nationalist", rather than trying to read tea leaves out of the reactions to an Internet troll.