The point is that how is a layperson to know which sciences are trustworthy and which are not? The media and school treat all sciences as equally trustworthy, and then it has turned out that some of them are pretty bogus. (Half of all published research findings are false, John Ioannidis, etc) So the layperson should be excused for being suspicious of all sciences, in fact it's a reasonable stance to take if one doesn't have the time or interest to examine each science closely.

Of course I have a mental ranking of which sciences are to be trusted and how much, but we can't expect the general public to take such an interest. It's just all science lumped into one big bucket, and it's not pretty.