Thank you very much, Eric, for posting this video.
I hope everyone will not only watch, but think deep about this.
It will be great if some of us can repeat this experiment and report here.
The key is to realize that it is not words that matter, but the true, heartfelt intention, as the wise lady in the video emphasized. This is why the experiment may not work for some, who mechanically do the experiment by just repeating kind/good words and bad/hateful words. One needs to speak with the true mindset, whether good or bad.
That is true in doing metta bhavana too. It is not the words, but the intention that really matters.