You say "by definition a right-wing form [...] it uses class divides to build its political power", but how does that match the right? The very first thing I associate with obtaining power via class divides is Karl Marx. There's also Mao, Lenin, Pol Pot, and anybody in modern USA politics who complains about the "1%ers" or "income inequality". I'm really really not seeing how that matches up as you claim it does. I think you need to accept the uncomfortable and obvious conclusion here.

I phrased that poorly. Fascism uses economic and class features that largely do not exist in a far-left society, such as a sizeable middle class and corporate power.

From Umberto Eco's definition of fascism: "'Appeal to a Frustrated Middle Class', fearing economic pressure from the demands and aspirations of lower social groups."

From Gentile's definition: "corporative organization of the economy that suppresses trade union liberty, broadens the sphere of state intervention, and seeks to achieve, by principles of technocracy and solidarity, the collaboration of the 'productive sectors' under control of the regime, to achieve its goals of power, yet preserving private property and class divisions;"

I understand that it is appealing to try to dilute the meaning of "fascism" by applying it overly broadly until it loses its meaing. Whataboutism is also convenient way for the Right to distance themselves from the evils committed by the right-wing Nazis and other far-right fascist groups.

The better way for the Right to distance itself is by supporting moderate democratic norms rather than giving in to violent populist impulses. Power is one heck of a drug though.

The world has gone 75 years without real fascism or Nazis, so the definitions shouldn't be changing, yet they have over the last 20 years. Older dictionaries and encyclopedias very clearly contradict the newer ones on the left-right measure of fascism and Nazis.

So, correcting for the projection:

"I understand that it is appealing to try to dilute the meaning of "fascism" by applying it overly broadly until it loses its meaing. Whataboutism is also convenient way for the Left to distance themselves from the evils committed by the left-wing Nazis and other far-left fascist groups."

The facts don't change just because some people want to fling a dehumanizing insult.