It's no coincidence those people telling you black votes shouldn’t count are the same people saying Covid is a hoax.
Conspiracies flourish on the right because insecure, stupid people have a desperate need to feel like for once they actually know something the secure, smart people don't. In addition conspiracy theories often get more and more far-reaching as time goes on. Theorists often start believing in more than one or two conspiracies (Qanon, school shooting false flags, climate change isn't real, etc.). Inevitably they hit a critical mass where their edifice of delusions can support ANYTHING they want to believe.