The reason that people fight against tankies more than what you call fascists is because tankies are far more prevelant than what I and most other people on the platform consider fascism. That is to say, your definition of fascism entirely fails to encapsulate what most people mean when they use the word, and so you shouldn't be surprised that they don't complain about fascism as much as you do. It's like if you went camping and then started screaming about how everyone's suddenly saying that arson isn't a big deal.

English has descriptive definitions; we look at what people mean when they say a word and then base our definition on that, rather than having an official definition that everyone is required to use. If you call liberals fascists, you are alienating a potential ally, and you're going to be called a tankie because that's the kind of backwards shit that Tankies do.

Liberals and fascists are different. You can disagree with liberals, but calling them fascists just lets fascism hide more easily.