Not being able to tolerate other opinions, mainly because those same opinions are weird and plain silly. So then you try to be aggressive and full of sarcasm in order to fight others.
Forum has changed a lot over the past 2 years. It's like a totally different place. People are so different.. trolling has hit the rock bottom, too much sarcasm (especially by nonprofessionals) and most importantly -- the WORST sense of humor nowadays. Hell, I've never seen so many lame jokes around.