In my experience, social/organized anarchists and individualist anarchist often talk shit about each other and do not actively cooperate. But do you know of positive examples of such cooperation?

I guess you mean cooperation of only those types of anarchism, then i don't know of any (though i dont know much). Otherwise they collaborate in groups that gather people beyond anarchism, i've seen movements including trotskists, marxists, various flavors of anarchists and non-affiliated people work together.