Americans are borderline obsessed with hotsauces and spicy food, though. IME, the pushback about english mustard is usually the same as with vegemite - its too easy to use way too much, and thus obliterate the flavours of the rest of the dish. (Plus it doesn’t pair super well with a lot of regional menus). In many restaurants (diners) there’s always at least tobasco sauce next to the salt and cracked black pepper, and nowadays most have a selection of hot sauces on the table to choose from.