If you have a negative net worth then I consider you poor no matter how much money you make

But yes obviously there are levels to it however regardless if you are buying overpriced fast food when you could be cooking at home for much cheaper that's not good for anybody especially if you don't make a lot of money... So what's your point other than trying to argue over the definition of poor?

If you don't have an emergency fund and your car breaks down and then you have to get into debt to fix it and then you have to spend more paying interest on that debt and you get stuck in a cycle... Compare that to reducing your expenses by not buying fast food and building up an emergency fund and not getting stuck in that situation to begin with