Originally Posted by
OverThereTooMuch
Because the anonymity of the internet allows many people to pretend to be something they're not. People post about the sorts of things that they wish they were able to do in real life.
And some post the things they really do.
Maybe some are lying about how they stand up to the TSA but for a fact, some are not. No way of telling, but even if every one is true that's still a tiny percentage of travelers and not surprising that OP (and others) have not seen evidence of it.