You’re friend wasn’t the first to make such a mistake. There’s a poem from 1841 by Robert Browning, called Pippa Passes, in which he misunderstands the meaning of the word “twat.” Apparently he thought it was the name for part of a nun’s outfit.
But at night, brother howlet, over the woods,
Toll the world to thy chantry;
Sing to the bats’ sleek sisterhoods
Full complines with gallantry:
Then, owls and bats,
Cowls and twats,
Monks and nuns, in a cloister’s moods,
Adjourn to the oak-stump pantry!
I know some people have different practices, but myself and the pilots I’ve known use a dipstick to check fuel level. You do you, but remember that aviation fuel contains lead, which is easily absorbed through the skin. I always use gloves when checking fuel.
I can’t deny that most pilots don’t use gloves, that there are fewer additives in aviation fuel, nor that we are trained to dump checked fuel on the ground. But I don’t see those as “green flags” for aviation fuel.
For anyone interested, here’s the Material Safety Data Sheet for aviation fuel. For comparison, here’s the MSDS for automotive gasoline. I wouldn’t want to touch either without skin protection.