system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Is there a reason why we hate certain smells or are we trained from the beginning to hate them?

I just rewatched the futurama episode where Zoidberg's gf liked his nasty smell because she never smelled anything else before.
gpt
Evolution has weeded out most people who do not respond negatively to rotting smells.  Being repulsed by smells like that prevent someone from dying by eating spoiled food and thus live on to pass those smell genes.