I get your point but hydrogen isn’t just sea water, you’ve got an awful lot more energy to put in after the “tank is full so wrap up the hose and drive off” stage to separate the hydrogen from oxygen to get the fuel. The difficult bit comes after “get water”.
People are mostly talking about what a bunch of idiots they are though.
This lot look like they were cast by the daily mail, they couldn’t be more of a caricature. It is absolutely not effective communication.