What you posted was uncivil. "What are you talking about" adds no information and is a variant of name-calling. Asking whether someone is "trolling or ignorant" is also name-calling, just with a branch in it. And "name X or retract your claim" is a form of intellectual bullying, so also uncivil.

Any substantive point you have will become sharper once you edit such rudeness out, so it isn't a question of "blunting", but of being respectful. Even if you don't respect the person you're talking to, you need to respect the community by holding yourself to a higher standard.