For me it’s driving while under the influence. If you couldn’t tell, I like me some ganja. However I have long since held the belief that it is utterly insane to drive while under the influence of most substances, with maybe nicotine and caffeine being the exception. All too often I see other stoners smoking and driving, which I simply can’t fathom. I’ve only operated a vehicle once under the influence and it was just to move a U-Haul around the block to a different parking spot, which was such a scary experience while high that I refuse to even consider getting behind the wheel again while high.
I fly a paramotor. For me, it’s reckless behavior. Other pilots doing dumb shit like flying over hazards with no “outs”. That just means flying in a way where if your motor were to die, you’d be forced to land in a bad place. Causing you to injure yourself or others, and also potentially damage property. Also pilots who are a nuisance and piss off the public. It makes us all look bad.
A common saying in the sport is DBAD, didyn’t be a dick. But some don’t abide, and be a dick.