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Well asked question. There are some objectively unpleasant odors for the body. They are usually associated with a variety of harmful and toxic substances. And they have become unpleasant as a result of thousands of years of evolution.
But there are no objectively unpleasant odors for human consciousness, these are all conditional and unconditional reflexes.
In my experience, I have always met a person who likes even the most disgusting smell. Time passed, and I met a person who likes an even more disgusting smell. But in more general terms, I think most people have learned through education what is pleasant and what is not, as well as what is good and what is bad.
They exist. For example, thiols, which are contained in the smelly secret of a skunk, which are added to natural gas (which, by the way, does not smell at all initially; this is to feel the leak), the smell of ammonia, some carboxylic acids (acetic, valerian) and other organic substances.