The good side of trolling is the argumentative side, it may help to strengthen an exposition by pointing possible flaws (such as bias, ambiguities, etc...). This is exactly what dialects is about... That is, it encourage to review the published material by taking the point of view of the others. Just like what they call dogfeeding (eating food you make for the dogs, ie: consuming what you produce).
In that context trolling would be similar to the role that bug reports play in software, leading to a change and improvement - evolution if you will - of the software, and - I bet intentionally - not different to what is done in the video.
Yet... I beg to say that that's not trolling!
[Note: I'm not talking about real haters, stalkers, bullies or harassers]
In my experience, one of the distinctive things of trollings is that the troll takes little effort* - instead they (try to) make the trolled waste energy trying to explain or debate things. Another characteristic of trolling is that the troll may not make a directed attack - instead they lay traps to whoever may come by - they are the trolls waiting under the bridge. And finally the troll comments are not required to be smart, yet they have to be clever - and often creative - to archive the desired disrupting result... they have to catch attention and incite a response** (better if it is an emotional response).
*: People may think trolls are people with no life and nothing better to do than to use Internet to... well... troll. Yet, in reality trolling takes little of the life of the troll. For them, it is just pranking, and it can be addictive.
**To all trolls: if you are a dedicated troll consider a carrier in marketing... you have already developed some of the key skills.
Nothing of that is good in a bug report. Still it is true there is a good side of trolling: you learn some thing you shouldn't do, like "feeding the trolls", and certain things that people simple shouldn't post online - really Why Would You Put That on the Internet? #1
Does trolling mean a different thing to different people? Sure, why not? - I mean, that is a characteristic of natural languages: the person who reads it is the person who gives it meaning.