1) He's whiny and annoying.
2) He only seems to have one topic to talk about.
3) He hijacks threads with unrelated posts.
4) He states opinion as fact without supporting sources.

Did I miss anything?
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I'd rather be ignorant than stupid. Ignorance implies a lack of knowledge which is easily correctable through education. Stupidity implies an inability to learn. Therefore; ignorance is temporary, stupidity is forever!