Globally it's probably not the most common one but growing up in the South a lot of people I knew would complain about how salty and disgusting it tasted. They were used to very plain food, under seasoned biscuits and gravy, barely seasoned chicken, grits with just shrimp no salt, etc.

Now, my own wife (from the North) also dislikes soy sauce though in her defence we found out she's allergic and that might be why.