Never underestimate the availability of stupidity. During one of the artificial fuel shortages on the Big Island a few years ago, my local filling station was subject to the usual panic buying queues. This clogged the roads so much, that the replenishment tanker couldn't get there when it was empty. Also, even though under pressure, the cashier spotted that a car had been 'filled' with far more fuel than it should be capable of carrying - and a fish tank was discovered on the back seat. Also, someone else was apprehended trying to fill a wheelie bin with petrol.
Masks are more about reduced infection from the wearer. Viruses may well be small, but the idea is to catch the materials that the virus is travelling on, rather than individual virus particles.