We actually experienced some of that, but not nearly as bad as a black person would, I would imagine. There were definitely racists there, we both saw and heard some really bad stuff. A bit off topic now, but anyway, there were a lot of strange views on women in general - I had to push an argie bloke up against a wall to save a friend of mine from being dragged into a toilet at a club (the same girl got shouted at and eyeballed by every single dude in the club - it was just the way it was). I was sitting with her and her friend once in a smaller bar when a guy approached me and asked me if I wanted to switch - he had two girls following him and looking at me to make a sort of deal. It was weird, and they had a few weird things like that.
So yeah, Argentina can be a mixed bag for sure, but there are lots of lovely people there as well, most of them I would say (we were there for 6 months), we only saw the really bad brick once alcohol and drugs were involved.