It's starch, dairy and processed/cured meat regardless how you make it. Usually meetups serve from counter takeout chains which makes it even worse. There is no argument for pizza not being a junk food.
Not to be too much of a devils advocate, but I usually eat pizza in the form of a pesto pizza loaded up with veggies. There's definitely an argument that could be made that pizza doesn't have to be unhealthy.
Also, "healthy" pizzas and tasty pizzas as sets have little to no intersection. Which is fine for food you don't eat day in, day out.
Have you heard of ordering pizzas without meat?
What kind of godawful pizzas are you eating that use processed bread as a base...