Philosophy

I'd imagin it's an evolutionary response humans have picked up. If your body expels it there's a reason. Humans that re-ingested something the body rejected may not have survived as well as those who learned to fear it thus creating a natural revulsion to anything excretory.

And then there are the right wingers who keep returning to their own brain vomit. I definitely have a natural revulsion to their repetitive unhealthy mental state. Maybe they will devolve out of existance.