When I criticize someone for doing something that I would do myself, I am a hypocrite because my criticism typically implies the pretense that I wouldn’t.1
The same glass house logic applies to hypocrisy itself.
Unless I have absolute certainty that I would never be hypocritical, which I practically cannot have, I cannot judge anyone of being hypocritical because this would make me meta-hypocritical, that is, hypocritical about my own hypocrisy.