There comes a moment in many toxic relationships when one person realizes the person they're dating is actually human scum. Satan personified. A flaming dumpster full of trash dressed up as a human. It's not the best moment, but at least we (hopefully) know what we need to do and GTFO of the relationship ASAP.
If we're lucky, we've mostly forgotten that person by now. But we'll probably never forget that terrible moment of reckoning when we realized someone we'd chosen as a partner was actual human garbage.