Just because some people may speak that way does not make it correct. When teaching a language one should always be taught the proper form first and foremost, especially for written language. Then how they speak is up to them. The beer is in the fridge. Bob brought all the beer. We drank a lot of beer. Bob had 8 beers, I had 1 beer. For the original sentence "Manden drikker øllene." I would say in english it should be something more like "the man is drinking [all/some of/many of/enough of/etc]. the beers" because in english that sentence seems to really need a quantifier.
Of course people should learn what is grammatically correct, and here both the English and Danish are perfectly fine (according to the Oxford Dictionary and Den Danske Ordbog respectively and Merriam Webster also lists beer as being countable in the examples). However, I have now added "He [drinks/is drinking] the beer" as an alternative answer, as it does seem a little unfair not having it
In my language is used precisely the equivalent of that "beers" in the common language. I mean, if i literally translate to english from my language, i should say exactly "the beers are in the fridge" and not using "the bottle of...". Seemt to me funny your comment knowing my language,knowing english and now seeing the danish version which didnt seem strange, on the contrary. :))
In England historically beer was not countable because one didn't consume it from a bottle - it came only in barrels. It's then served in pints - which were countable. So: I went to the pub and drank some beer or I went to the pub and had two pints. In America beer is mostly served in bottles and so its countable: Let's have some beers. Younger people in England use this as well, but it sounds American. If an English person says beers, the implication is that its bottled lager.
Okay guys there is no refrigerator in the sentence so let's put that refrigerator to bed. Just pretend somebody took the beer out of the fridge like a whole box of it and he's breaking out whichever can bottle what have you he has of the beer and is drinking it's a very simple statement you're complicating it