The traditional and absolutist definition of authoritarianism and fascism includes lefties and well as righties. For crying out loud, the father of fascism, Mussolini, was absolutely considered a lefty until a progressive's prospective placed Mussolini as a righty.
Mussolini and Trump are righties from a progressive's prospective since there isn't much political ideology to the left of progressivism. Which is, in turn, taught in public schools and becomes the indoctrination of the public school student by the left and which leads to the advent of the age of misinformation.
For example, if one were to ask GOPers if Trump was a lefty or righty you'd probably have as many responses of lefty as righty.
Since progressives are all authoritarian or at least, progressives falsely claim ('cause Trump isn't authoritarian) that one must be authoritarian to be fascist, the claim by progressives of all fascists (or authoritarians) being righties
is an authoritarian move because the rewritten definition of authoritarianism and fascism is succinctly placing 'blame' on those who disagree with authoritarians - with progressives.
Sidenote: Is the rewritten and from a progressive's prospective definition of authoritarianism and fascism wrong since not all fascists and authoritarians are righties? Is the rewritten and from a progressive's prospective definition of authoritarianism and fascism wrong since not all authoritarians are fascist (according to progressives, Trump is fascist while there is no proof Trump is authoritarian, IMO)?...Rather, there is no proof of Trump being authoritarian 'cept for authoritarian claims, IMO.