Fascism is a disease, a delusion, a toxic worldview. It’s encouraged and manipulated by propaganda. Its characteristics are numerous and to various degrees widespread and long-lasting. At what point their combination in sufficiently extreme degree rises to the level of fascism, as opposed to moderately fascistic tendencies I’m happy to leave to others to decide.
Fascism is not a tendency born into subhuman monsters who threaten the purity of our anti-fascist homeland, as one might suspect when reading posters like “The only good fascist is a dead fascist” at anti-fascist rallies.
Fascism is not easily eliminated and not best eliminated by simply any random opposition to it, even opposition that much resembles it. Eliminating fascism and how best to do it is a reasonable topic of discussion which necessarily involves opposing some tactics as less effective than others. This means that it is possible to oppose an anti-fascist act without being a fascist — although not without getting called a fascist.