Is English a fascist language?

Arguendo, let’s accept your premisses:

Everybody expects non native speakers to know English and speak it fluently and hate them for not doing so. Also this language is invading all other ones.

That wouldn’t make English fascist, and using a loaded term like that inaccurately means people won’t take your argument seriously. (And that’s not a “native speaker” bias: the same objection would apply in any language that has borrowed the term to refer to a particular political ideology exemplified by Mussolini.)

To use my favourite term at the moment, as defined by one of the victims of Mussolini’s fascism:

That would make English hegemonic.

And there’s no malice to hegemony. It’s the stuff of the Melian Dialogue: “the strong do what they can and the weak suffer what they must”.