What you're effectively saying is that contributions to Wikipedia should be reserved for people who are highly involved with Wikipedia already. Outsider? No chance. Why allow every peasant to add stuff, right?.
I derive this assumption from your statement that his contribution, effort and attitude was "wrong", "minimal", and "poisonous". I don't see any of that. I see a rant following a genuine effort to contribute, a contribution worth considering, and an attitude that started off with the best intent but got punched down in the process. Who wouldn't turn sour after such an experience? It's called cause and effect. Of couse you'll be pissed if something as ludicrous as this happens to you.
Unless you're so caught up in your little world of the 'inner circle' that you don't tolerate outsiders. Unfortunately, that's not how the world works. That's also not how Wikipedia is supposed to work, I hope. That doesn't sound like the spirit that Wikipedia tries to portray at all. It sounds like the exact opposite.
On your "consensus" argument: since when is a 7-6 vote a consensus? That's a nearly even split. Please.