It happens everywhere. Again while it is a puplic place it is not owned by the puplic it's privatley owned and therefore managment has the right to refuse entry. Most pubs and clubs will set a cap on how many singles they will let in to avoid the crowd becoming too one sided it just seems to me that here they will also set that cap on nationality as well. In sydney try going to a gay bar after 10pm and as a straight person regardless of gender, regardless of color, regardless of nationality and you will be refused entry.