He could post a swastika on shitter and people would still deny it and argue that the swastika has other historical meanings and obviously he doesnt mean it in a Nazi way. We live in a post-truth society. Facts and logic dont matter anymore. They will not admit they are Nazis until their boots are on their necks and they are put into camps. Some deny it because they are bad-faith actors actively hiding their true Nazi intentions, and others because they are trying to protect their own mental wellness by denying the reality that the fascists have taken over.