Technically speaking that's hardly a failed experiment.
The bot has adapted herself just fine to Twitter, a platform optimized for trolling
How do they fix it though? It doesn't seem like balancing it with more "normal" input would be enough. They almost have to teach it good vs evil (morals), or else give it a way to recognize sarcasm and trolling from normal discussion.
Side note: as a parent of teenagers, humans seem to pick up good vs. evil much more easily than recognizing sarcasm and trolling. Wonder which is easier to teach an AI?
Be careful what you wish for.
The same group of people who taught AI to troll will find a way to turn the morals upside down.
With logic.
What is seen here, done by the bot, is only trolling (in the net.art sense) by virtue of the groundwork already done by many (legions) human trolls. Once this groundwork has been done, it's band wagon time, foot soldiers, running the joke into the ground. Of course that part can be done by modern AI bots. It could even be done by much simpler bots (see: twat-o-tron). It's also the part where sometimes the early, more skilled trolls check out and start complaining it's all gone to shit and not like it used to be, etc. (IMVHO it's just part of a natural cycle, but I can appreciate that some individuals prefer to join different parts of that cycle)