I'm not an official either, I didn't write the rulebook, and I haven't studied it. If it's unclear, I'm definitely being very facetious about the sanctity of the stanchion and all that. As I have said before, I couldn't care less if Caitlin or anybody else decides to have an MMA fight with the stanchion, and I have zero opinion on any rule about mistreating it, if such a specific rule exists.
All I know is that other players have gotten techs for hitting the stanchion in anger, or doing other similar things to/with the scorers' table, the ball, and other inanimate objects. Caitlin is absolutely not alone in that regard. Last I heard, from one of the commentators, I believe, they consider such actions disrespecting or being disrespectful to the game, hence the techs. Nobody has to like it or agree with it, and again, I have no opinion on it, but girls gettin' T'd up for it, so clearly it violates a rule somewhere.