Freaking out about stuff like that is relative to how stupid you want to look. Everyone knows that PG is not antifreeze just like margarine is not plastic but some people don't mind looking like idiots by telling everyone that they are the same thing. Heck, I made a 68 in chemistry and I even know that!
Oh, I think you are giving the general populace too much credit. If the FDA said that our juice contained the essence of the Anti-Christ in it, the general populace would believe it, because why would the FDA lie to them?
The FDA says that e-cigs have anti-freeze in them, and the general public nods their head in approval of the good work that the FDA does in protecting us, they won't question the findings, they won't even bother to look up PG to find out what it actually is, what else it is used in, etc. And they won't believe you for telling them that PG is used in fog machines simply because you aren't the FDA, how could you know better than the government agency tasked with protecting us from harmful products.
Its sad really.