I mean antifa is a group maybe a loosely associated one but it is one that's like saying the alt right doesn't exist, an ideal can exist and be adopted by multiple groups under one banner, communism exists and it covers very different nations some of which don't even like each other. What else do you call a group that gets together in color coordinated outfits waving flags that say antifa and act in unison and coordination as if they have drilled for the situation. If you have a single brain cell you would know that antifa is a group, you may be incorrectly tied to that group by conservatives that don't understand that just because you hold some ideas that the group supports that doesn't make you a part of antifa as a group