The reason you are seeing anti-fascists portrayed as terrorists, as worse than the Nazis and white supremacists, is because the anti-fascists are a threat to the existing order and the Nazis are essentially an extension of it — or at the least not a threat of any real sort.

The same thing happened in Germany during the 1930s and in other countries too. Many supported Hitler as they saw the Nazis as the best bulwark against Communists and other similar groups.

History as it often does rhymes.

If you believe that antifa forces are truly equivalent to Nazis, white supremacists and the KKK, you are quite susceptible to propaganda and you should really do something about that.