You can block them so you don't have to see it.

If what they're doing is egregious, against community or instance rules, stalking, harassing, etc you can report them which notifies the mods of the community the post or comment is in, the admins of the instance of the community the post or comment is in, and the admins of the user's instance.

Edit: Found the context- https://lemmy.world/comment/23272922

If you feel that he implied you were a pedophile, and he disagrees, then fucking report it to mods/admins and let them sort it. I'm not seeing anything but bog standard responses to some of your posts that you respond to with your little copy pasted message. I could understand if they kept making references to it, but I don't see where it's been brought up where you didn't.

Just report and block and move on with your life.