The article you linked goes to great lengths about Orwell's alleged scotophobia. I don't see how particularly hating scotts supports "intentially treating those cultures as identical". If that was true, then Orwell would equally hate all scots and englishmen.

Also, what's the downside of treating different cultures identical, aside from potentially offending people? As opposed to other kind of racism, where other people are treated as lesser subhumans that ultimately led to slavery. Why are both casually referred to racism when the other has more far-reaching consequences.