Well, biscuits used to refer to essentially just hardtack so by "traditional" English standards both the modern English and American usage of the word is incorrect and unfounded. Traditional biscuits would have neither been soft and bread-y nor crumbly and sweet. They'd have been essentially rocks of flour. The Latin term that biscuit is descended from etymologically quite literally means "twice-baked."

Of course, no one defines a biscuit that way anymore. We all know contextually what things refer to nowadays in a globalized society and using our big ol' brains we figure out what one another means well enough.

Unless you're literally anyone from the island of Britain (or were taught your English by them), apparently, because I see you lot online trying to chastise everyone else for their use of the language way more than anyone else in the Anglosphere. Frankly, at a certain point, you guys are the stick in the mud and need to catch up with everyone else in the entire rest of the globe. That doesn't mean giving up your 'u' in color, exactly the opposite actually. It just means that a part of living in the modern world is accepting that you'll need to speak to people from all around the globe and learn to be a big boy and discern meaning even when it isn't immediately obvious to you.

Holy shit for people notoriously known for despising the French you think you guys would stop trying to do your best L'Académie française impression on the internet all the fucking time.