I needed to re-read your comment twice to understand what you meant, because I got it completely wrong the first time. This is how I understand it now, so I write it clearly for readers like me:
What is the dominant form of nationalism (in Orwell's very loose sense) today in our society?
Would criticizing it make other people percieve you as one of people considered dangerous delusional extremists?
I abstain from the first question, and the answer to the second one is: yes, and it is kinda scary. (Well, disagreeing with majority on a topic that the majority blindly follows is always scary.)
What is the dominant form of nationalism (in Orwell's very loose sense) today in our society?
I'd say... antifascism?
I have found this most wonderful (if fairly lengthy) article, and thought you would enjoy having it brought to your attention.
It is so good, I think we should include it among the references in the "Politics is the Mind Killer" wiki page. But, before that, I submit it to you, and ask you: is there anything in this article that would warrant its exclusion from this site? I mean, besides the fact that it is about politics, and written by a notorious Social-democrat (And is that in itself grounds for exclusion?).