Bartenders that charge different prices for the same damn drink

1 star to bartenders who charge different people different prices for the same damn drink and to different bartenders who charge different prices for the same drink at the same damn bar.
I understand if you’re hooking someone up that you know, but charging different prices for guys vs. girls or people who you’re attracted to or not or who you think will tip you or not is pretty shady. I’m sure there’s some undisclosed bartender unwritten rule saying they can charge whatever they feel like whenever they feel like it when they’re working the bar and write up whatever on the register and pocket whatever as a tip.
I’ve noticed this in San Jose, San Francisco, Las Vegas, and I’m sure it goes on everywhere.
The most memorable moment of this, was when that gay looking Asian bartender dude at Taste that looks kind of like the gay Asian receptionist on Entourage hooked me up with a LC and a Corona for only $ 8, and then my friend’s kinda hot ex-​gf just orders a LC and he charges her $ 10 for it. I thought that was hilarious.
But seriously… If you’re at VooDoo Lounge, they charge more for drinks at the Mezzanine Bar upstairs for private parties when you need wristbands than at the downstairs bar, probably because they figure you’re not going to tip, since you have to already throw down a gratuity fee for renting it out. I’ve noticed this at Taste, Motif, Tiki Lounge, etc. I think it usually depends on who’s bartending and what day of the week it is and how busy they are, but at least show some consistency or don’t give me attitude when I say WHAT REALLY?! THE OTHER BARTENDER WAS CHARGING $ 2 LESS FOR THE SAME DRINK? Ahhh… I guess that means you included your tip in that price. $ 0.00 with lines through all the zero’s for your tip with a smiley face by my signature.
=)