It isn’t just familiarity. Some people experience some fish sauces as having vividly foul flavor. This includes people who routinely eat anchovies, cured fish, etc.
Yeah. Technically I suppose you could describe it as a fish sauce but definitely more on the umami and vinegar side. I'm also not sure the degree to which Worcestershire Sauce is especially a mainstream American condiment. I have a jar in my cupboard. Not sure how many houses do.
Nah fish sauce is different. You can give most midwesterners fish and chips or worcestershire and they’ll be fine with it. But many will find fish sauce initially pungent and repulsive until they get used to it