The Power Rangers director is obviously referring to icons of the superhero genre like Iron Man and Superman.
While most superheroes have incredibly outlandish backstories, abilities, and resources that make them inherently distinct from audiences, the Power Rangers are different because of how average they are in their day-to-day lives.
You do not need to be an expert in comic books to understand what Dean Israelite is saying about the overarching superhero mythology that we have come to expect from comic book movies.
All it takes to become one is to be a “teenager with attitude.”