The culture where I live seems to be very different. In the mid-afternoons and late evenings, going to the bar alone or otherwise, is very common. The intention and effect is to spark up conversation with others at the bar. This is very much the norm here in Toronto at least, and certainly seemed to be the case other places I have traveled. We do still consider it rude to "mither" people sitting at the tables. But if you're at the bar itself, unless you're wearing headphones or buried in a book, it is assumed you're there for the chatter.

We also have quiet lounges, where the intentions of this bar owner would easily be compatible.

Speaking of - the bar owner's policy indirectly excludes most travelers.