I've had this conversation and the way I explained it is that our grapes are closer to the boba in bubble tea. It's not quite right (they don't pop quite as much) and boba isn't Japanese, but it gets the point across.
Is there a grape variety I’m entirely ignorant of?
I've visited a number of European winegrower family farms and they frequently also grow table grapes for their own consumption. The table grapes they eat are much much less sweet than vinifera grapes where the yeast consume all the sugar into alcohol and which are basically too sweet to enjoy.
I'm unclear why such a simple question appeared to offend at least one person.