There's just something extraordinarily mediocre about modern gaming elitism. I remember when people got made fun of for playing Halo and Call of Dooty. And the thing is that it's not like COD players try to argue that COD is harder than UT or Q3A. Dota elitists are the same deal. They shit on other mobas as if Dota wasn't shit on back in the day for being played by people who sucked too hard at WC3 (which in turn was shit on for being played by people who sucked too hard at real RTS).
The elitism simultaneously shits on other games below the totem pole but pretends that games above the totem pole don't exist. In other words, it's a defense and celebration of being in the middle of the totem pole. Hence, elitism of mediocrity.