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The main reason for humans not eating one another is in-species nepotism, I believe. It's not very principled, but probably closest to the truth.

There is also don't mess with the effectively most powerful species on the planet whose members have collectively decided that (for somewhat principled reasons) none of them should be eaten.

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Disease is actually the main reason.

Any parasite, bacteria, virus, and especially prions spread much much more easily the closer the food is to your own biology.

Cannibalistic tribes have had issues with this in even the recent past.

Good point. This needs an update though now we know more about zoonotic spillover. Pigs, monkeys, bats, etc. should be off the list asap.

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