Let me talk you through what a day on coke at the football looks like.
This is what happens. Lads have a few pints to whet the whistle, normal stuff like everyone does.
You a bit tipsy/lively. You get a bag in. Costs about 50/60 quid or 3 for a 100 (you may have seen memes about this on-line)
The coke "sobers" you up. You feel normal, excited, feeling good. Super chatty, really enjoy your company. "CITY TIL I DIE!!" "**** THE GAS" all that shit, its fun.
You continue to pour more booze into yourself because you don't get "drunk" (you ARE drunk but are able to stand up straight and hold a conversation without slurring, a bouncer will let you in places for example)
So by this point you've had ten pints but to the outside world you look like you've had about three, but in your head you are proper mashed. You may feel OK but things like decision making, paranoia, excitement increase ten fold.
Something might happen, you might get aggro or overreact and then there's a problem. You don't think about any consequences to your behaviour. Fight might start, you are rude to people, obnoxious "Lads Lads Lads" etc.
Coke is a stimulant, but pouring a shit load of cider on top it makes actions and behaviour much more unpredictable.
This is how you create a bellend. And if you went out in town tonight you'd see hundreds of them, they are everywhere.