"Who the hell is drinking at 10:30 am anyway?"
People who work night shift. And Friday is payday. I went out with coworkers when I was working nights. Get off at 6 or 7 in the morning and go to the bar. Drink a couple beers, have some breakfast, hang out then go home and sleep.
There were other locals there at that time of the morning and I'm not going to say that they were fine, upstanding individuals but there were no harsh words, arguments or fights.