It’s always been a fruit to me, MD. My mother used to bottle it and stew it, served with custard. My dad made rhubarb wine. I wouldn’t actually think of serving it as a veg though perhaps botanically it is a vegetable. In the same way, I regard tomatoes as vegetables even if they’re a fruit.
I think I could have missed the point of the OP though! Is it a forbidden subject? 🤔