obstructionist
A total mess-up who blocks everyone else just to look important and act like they’re the boss, even when they’re clearly the problem.
My mom is an obstructionist. She blocks the whole family from getting pizza just so she can argue about the toppings.
The guy in the back of the class is an obstructionist. He talks the whole time so no one else can hear the teacher.
My dad is an obstructionist. He won’t let me go to the park unless he gets a donut first.