Is there a way to design end game content that doesn't lead to a caustic community?

[Volkai]

Over ten years of playing MMORPGs, one thing that remains constant from every game I've jumped to is the end game community turning hostile to new players after the content has been out for a while. And by new players, I don't even mean those with no experience on a given encounter. They can have the fight practically on farm status, but the second they switch to a new role and mess up even once they turn on even the most skilled of players.

In the back of my mind, I kind of know the answer to the question, but what do my fellow forum dwellers think about it? Is it just a result of the social ineptitude of a few players or is it really incompatible communities clashing with one another?

Pretty sure City of Heroes managed to have endgame content while maintaining a not-caustic community.