What authority would you accept that fascism is right wing?
None. An "Appeal to Authority" is a logical fallacy.
I suggest you look up the term.
Unlike you, I can think for myself. It is patently obvious to any thinking person that there is no such thing as left wing dictatorship, and right wing dictatorship.
It simply doesn't exist.
There is total government on one side of the spectrum.
And absence of government on the other.
That's it.
Tossing in qualifiers, and behaviors doesn't negate that simple, basic truth.