People are super weird about "healthy" eating. They don't actually understand what it means to be healthy and just have a negative gut reaction to certain types of foods that have been demonized online.

Red meat is one such food. It's funny, because you'll also see red meat championed in other online content like male oriented and fitness related places.

But, you're right. Burgers are not super unhealthy, but they are often prepared in fairly unhealthy ways or served with deep fried sides, unhealthy drinks, etc. A regular ass burger on normal buns with normal vegetable toppings and a slice of cheese is fine. You could eat a few a week as part of a healthy diet. Just don't drown it in cheese, condiments, or weird fried toppings. And consider having it a side that isn't french fries.