1. It is my way or no way. Only my views can be right. There is any other viable proposition.
2. They see themselves as THE errxpert. Nobody else knows anything, even those with more information.
4. They are only interested in theorising and dictating, not doing. Everyone else, including those with facts that are not in the public domain, are ignorant.
6. They regard any question as an insult and a challenge to their intellect.
7. They will sometimes manufacture ‘proof’ or twist facts to vehemently defend their positions.
9. When they happen to be right about anything, they get very snobbish.
10. They pretend to be very broad-minded but are actually very parochial in their interests.