Do not disagree disputatiously or contentiously. Look at a disagreement equally as an opportunity to teach as well as to learn.
The difference between knowledge and opinion is presence of reasons for arguments. When you disagree with knowledge, you should also give reasons for that.
Preconditions for thoughtful controversy:
Reasons for disagreement:
Be definite and precise about what the author is uninformed, misinformed, or illogical.
Thoughtful disagreement is one of the components of The Reality Group culture.