I don't think "smol pp" is meant to be unfriendly to women, but it's telling that men are expected to self-police such utterly innocuous jokes when women are present even though you couldn't find a phrase less applicable to women if you tried.
Again... no?
If you read an article where the author says "that's training bra thinking", the author is female.
If you read one where the author says "that's smol pp thinking", the author is male.