"nothing to contribute to the discussion"

I think you're saying that he has no spit on EF or CP, spread rumours or corridor noises, make assumptions on what and how EF and CP do things, or how shameful they were to go to Siggraph, right? ( I won't provide any quote: you just need to read your own posts.)

Indeed he did not have your brilliantly positive attitude. Such a shame.

"personal attacks"

Do you mean things like: "I usually wouldn't touch a merchant with your attitude with a ten foot pole.", or maybe: "Olivier go troll you own boards will ya", or was it "Looks and sounds to me like he's written himself one of those stupid AI Alice Psychiatrist programs that people find amusing in their non-responsive answers. He obviously has nothing to contribute and is somehow amused by his own idiocintricities.", or this one: "Why do I keep being surprised when talented people turn out to also be jerks?"...
So, mister Mizrael, when will you stop playing the role of the victim? When will you stop inducing false statements and a global mispleasant feeling about these 2 companies that do their best for us all? Why don't you search for a more positive way to express what you feel? Are you so bored with life that you can't make it joyful anymore? It is not meant to be insulting. It's just that I really can't understand how you can keep that attitude. Any enlightment from you on this question would be greatly appreciated.