More worryingly, I wonder what subjects I don't notice I can't think about objectively.
One warning sign is attributing disagreement with your views on a subject to "bias", and then engaging in armchair speculation about the psychological defects that must be responsible for this bias. For an example, see the article linked in the original posting, and almost the whole of this thread.
For an example, see the article linked in the original posting, and almost the whole of this thread.
Or for that matter most of the sequences.
The last point reminded me of speculation from the recent LessWrong article Conspiracy Theories as Agency Fictions:
Before thinking about these points and debating them I strongly recommend you read the full article.