Challenging assertions made with limited facts is not attacking people.
i will correct your distorted translation of event....
Challenging people experience and testimonies which are "limited facts", yes, but they are anyway facts, with no experience with the product whatsoever, even no knowledge at all about the content of this product, is not challenging but criticizing people with no facts at all... Not even limited one....
Then bashing someone room, speakers, and integrity after that to go on with the ridiculizing of the same product deconsider any form of seriousness...
Real Knowledge is always based on discerning facts.
Try that yourself....