[WarOnPrivacy]

Ultranationalism means what it means. It is "an extremist form of nationalism characterized by radical loyalty and devotion to one's own nation".

ref: https://www.merriam-webster.com/dictionary/ultranationalism

Fascism is a more complex but is basically is a far-right, authoritarian, and ultranationalist political ideology. It's adherents tend to

    Exalt Their Nation and Race
    Embrace and Support Authoritarian Governance
    Condone Militant Nationalism and Violence
    Prefer Social and Economic Regimentation
    Parrot Populist Rhetoric
    (credit Wikipedia, Britannica, et AL)

[like_any_other]

You can't expect anyone to take seriously warnings against not just nationalism, but ultranationalism, when it is the policy of most western governments to dismantle their national identities:

https://www.telegraph.co.uk/news/uknews/immigration/10055613...