I think the most effective reply is highlighting their methodology and moving on, rather than allowing yourself to be bogged down in rebuttals. You can never convince them because they are not “debating” earnestly, and the audience they are performing for isn’t interested in following a debate and will dismiss both sides.

Agree completely, I also just feel it’s important to highlight that style of inauthentic behavior.

What are you accomplishing, right here, right now, with this comment?

The function of accounts like the one you are replying to is to encourage cynicism and inaction among otherwise anti-fascist people.

Failing that, they will try to exhaust you with “debate”.