So every other person in the world that says that muscle weighs more than
fat is wrong? Every Doctor, Trainer, Weight-loss specialist is wrong and you're right? Seems fishy that everyone else in the world is deceived....maybe it's a conspiracy theory.
It is quite possible to communicate truth without being mean. State the 'truth' but don't ridicule, embarrass, or humiliate other people. It takes a lot of guts to ask for advice---especially about weight-loss, the last thing someone who is putting themselves out there wants to hear is 'your a fool for following such a horrible plan'. Is it that hard to be nice and say, oh I don't know... 'It sounds like the plan you've been using has a few problems, let me see if I can help' Big difference.