Former bartender here. Worked in Wrigleyville and other high volume areas in Chicago. Although I see what you're getting at, it's just not true. As bartenders you become invincible to loud idiots. They are the last ones to get served, for two reasons.

1. they are being loud and obnoxious
2. they are usually younger shit tippers and haven't learned proper bar etiquette.

Ive been that guy, then become a bartender and learned to hate that guy.

Here's how it usually goes in order of who gets served first in high volume bars.

Hot women > Regulars/Good tippers > Off-duty staff members > More mature looking people > Friends > Non douchebags > check all above to see if anyone needs anything > throw a coaster down in front of loud idiot and walk away (this is to psychologically break him down in hopes he will realize he's a loud idiot) > check all about above loud idiot once more > take loud idiots drink order "what's the cheapest beer and shots you have"? - loud idiot hot chick walks in bar I walk away from loud idiot and flirt with hot chick. shot on the house > get loud 2 draft PBR > rinse and repeat until bar closes.

Loud idiot tries to take hot home chick

she's gives me her number instead ;)