Juice gives delusional whack-jobs that false sense of toughness. (They are already demented).
Plenty of level-headed people who juice for competition (not gym-juicers) remain level-headed when on it.
Heck, just lifting alone turns many into Billy-badass in the gym these days. (Dropping weights, yelling, leaving shite everywhere, mad glances around the gym at people, etc).
Highly comical stuff. (CrossFit bred a new type of person, the "weight dropper").
Then there's the lifelong powerlifters from the 80's/90's, who lift crazy weight, put their weight down quietly, put their stuff away when done,
keep to themselves, and most would not want to mess w/ them, nor would they invite such nonsense.
Add in a little juice or prohormone to the modern billy-badass, and it ups their "douche game" a bit. Plus Instagram, they only watch the douches like themselves, and that's who they learn from.
(Shoot gear, drop weights, be an "upper-body only" queen, take selfies, play on their phone, take videos, yap out loud on their phones, etc).
Again, so foolish, its a bit comical.