Most fighters go on far too long, Shavers was struggling with journeymen and got battered in 2 rounds in 1995... Far too old. No rational human would hold such a grudge against ANY boxer to continually gloat about it several decades after the fact.
You're intense, obsessive distain goes way beyond boxing, did you oppose the civil rights movement Bill? I'm struggling to think what else could be notable enough to not just have left a chip on your shoulder, but completely severed it.
It can't be the trash talking? Ali wasn't the first, maybe the brashest for his time but boxing has seen PLENTY of trash talking since so it can't be that?
You're an old man, so it would make sense.