New aphorism

In my experience, this simple rule of thumb is invaluable in politics, psychology, and anywhere else which involves dialectical discourse:

Criticism always says more about the critic than the criticised.

(Ref: previous post on psychological projection.) If you read person Y saying "X sucks", then they may be right or they may be wrong, but what is 100% certain is that you can see clearly what person Y means by "sucks", and from there speculate about their inner life, or at least what life experiences might have led to them to adopt the reality tunnel where object X conforms to the category of "sucks".