"At the bar" implies standing next to the piece of furniture where the drinks are ordered and gotten. "In the bar" implies being in the building/room/whatever that contains that piece of furniture.
Yes you're right, but where I am, we usually don't say "in the bar."
"Where are our friends tonight?" --"They're at the bar," regardless of referring to the building or the bar itself
Agreed, seldom would someone say they are 'in the bar'. At the bar, at the concert, at the restaurant
I don't think I would ever say "in the bar," that sounds like I am hiding inside the actual counter. "At the bar" sounds much better for being at the building, regardless whether you're at a table or sitting at the bar.
Maria. It was not "baru"? Therefore, which case is "baru"? (The sistem doesn't allow me to reply the comment)
Hmmm. I don't see any comments by "Maria", but, according to http://aztekium.pl/przypadki.py?szukaj=bar&lang=en& , it's genitive.
What gender is bar The only ze locative ending i can find i feminine, but bar does not end in an 'a'
It's masculine inanimate. The ending is not "ze." When a Polish word ends in an R, the R becomes "rz" before E. Just like T becomes "cie" and D becomes "dzie"