For the record, I am "antifa". I'm anti-fascist.

I think this is wrong - and ends up making discussion harder by not sufficiently recognizing the context of how words are being used.

Words and phrases often have additional meanings that are different from their literal meanings, especially when used to represent more complex concepts. Trivially, you have things like idioms - "letting the cat out of the bag" almost never literally means to release a feline from a sack. And the same is true in political discussions - I could say that I am "pro-life" because I am in favor of things being allowed to live, or that my housemate's rabidly anti-abortion girlfriend in college was "pro-choice" because she liked making decisions, but that would be confusing to the point of misleading in most conversations because those terms are commonly understood (and intended) to convey meanings other than the literal one.

The same is true of any modern discussion of the term "Antifa" in the context of political resistance to far right groups. It is not merely an expression of being against fascism. In context, it is usually intended to refer to (and will commonly be understood to refer to) a specific political movement in the United States. If you use the term, "Antifa," it almost always refers to that political movement - but I think at this point, even saying "anti-fascist" would more likely be understood as a reference to the political movement than merely being against fascism.

I would say that I am against fascism, and very much not Antifa. In almost any context in which you would be using a reference to Antifa, those terms have two different meanings.