Obligatory, sorry for likely mistakes, English is not my first language. 

Quite a soft AITA compared to the nasty stuff you see here.

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Back in 2016, I was an exchange student in Poland living with other exchange students (Erasmus+ for my fellow Europeans here. It was my birthday so we threw quite a big party, lots of people, booze, beer pong you name it. 

When we were out of booze, some of my flatmates suggested I could go to the liquor store 10 meters away from the flat to resupply. I was a bit taken aback by the request and calmly said I was reluctant (money wasn't and issue)

 They asked me why I didn't like this idea and I explained them: In the place i've been raised and in all the birthday parties I have attended (mines or friends), the person whose birthday it was didn't have to spend a single Euro on anything because it was entirely up to the guests to buy everything. (In a house party setting, if I was celebrating in a bar, I would pay for my own drinks unless a friend offered to pay me one.)

They basically told me, since they bought me the presents, I could at least contribute to the party in some way. I was flabbergasted by such an argument , thinking it was super rude to phrase it that way.

 There was a bit back and forth but since it was my birthday I didn't wanna make a fuss about it and act entitled so I just went to buy the beers (and it was freaking cheap anyway). I spent a wonderful night, got shitfaced, and got really nice presents from my friends so everything went well and all was forgotten quite fast. 

I wasn't sure if it was a cultural thing because one my fellow French flatmates agreed with the fact that you should also buy supplies on your own bday. Maybe it was the exchange student setting where even though it's  bday party, we organize it as a regular one anyway so everybody contributes, I dunno. Maybe you guys have the answer!

So, should I have been reluctant to buy booze on my own birthday party ? Did that make me TA? 

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