What is an 'Elitist'

[HeroSamson]

I've seen the word thrown around too many times and different people give different views. So I wanted to know what do you guys view as an elitist?

One who checks people gear and if doesn't meet their standard they leave without giving them a chance.
One who thinks they tanked the whole party to the end.
One who says their dps is the best.
One who says everyone cause them to die except himself but dies first.
One who has to have best gear and gear is everything.