I generally lurk more than I post content or comment because I naturally tire from the vast majority of online and offline interactions with people. The exception being those people who share the same autism/adhd based experiences and perspectives that I do.
When I interact with fascists online, I already know it's a dead end to the conversation before it starts. That's why I begin an interaction with a fascist with the mindset of it being a chance for me to learn and understand their mindset instead of trying to change a person. I also have a 3 comment limit with a rough plan on how my comments will be used during this interaction.
The first comment generally asks to clarify a specific point that they are making. The second comment depends on the response I get but usually ends up with me pointing out a flaw or contradiction from the fascist. The third is a closing thought and a reminder of how they failed to have a clear and understandable argument to continue the conversation.
I have a very broad and hard to explain understanding of how hate and emotions work. This comes from experiences and observations from my life. So this comment format sort of plays out predictably when the fascist inevitably responds after my final comment. That's where I find the most insight into their thoughts. That's where I find that missing bit of information that makes it click for me.
I rarely engage them unless they spark a morbid curiosity in me. It's better that way since it's much easier and mentally healthier to just let them pass by my screen than to weigh down my thoughts with pure negativity.