Yes, you have the right to say anything you want within the rules of these forums.  It does not matter whether or not your statements are posted in the New York Times or on these forums.  Should the preponderance of evidence show that your comments (proven false by delivery of product) caused harm to BFL, then under civil law BFL has the right to file a tort against you.  Would they?  Depends on their mood I guess.

This goes back to yelling fire in a crowded theater when there is no fire.