Classic strawman argument.
Do you actually expect me to refute it point by point? Do Doctors or dentists take the time and effort to refute medical advice given by non-medical professionals who render free medical advice?
You might think you are Mr. knowitall, but to borrow a term from a totally different area: תכלית הידיעה שלא נדע. Or in other words, when discussing something, a person who isn't properly trained, tested, and subject to regulatory supervision might have partial knowledge or understanding, which could be worse than no knowledge. A truly knowledgeable person knows what he knows, and where to defer to someone with more specialized knowledge.