A lot of people are living in a bubble. They are proud of their country and in effect because of that put to high of an importance, thinking we are in the centre of the universe.
A lot of people will be in for a shock if we do leave. It will be a rude awakening of where our neighbours rate us in terms of importance.
That'd be around 5th then, out of the 190~ countries. It's quite high on the list.