Sour cream. I have a theory it's like cilantro: some of us have a gene for where it smells spoiled to us, and those of you who like it can't smell it.
Cream cheese is similar but not as strong; if I don't smell them the taste is fine.
It has faded with age (probably as my sense of smell overall).
What’s the most widely enjoyed food that you can’t stand, not because of allergies or anything but just because you hate it?