J Law is not the polished star Kate is, and tbh to expect her to be is madness - not only are they two different people, but J Law's appeal has been widely attributed to her everygirl demeanor.
I don't think J Law is vulgar in wanting to speak openly about the wage gap between men and women in Hollywood. She has a big voice in Hollywood right now and if that's where she wants to lend her voice to, it's not really in Kate's place to judge her for it.