Diane is a very controversial character in my opinion. everyone likes her because she's seen as a "cool" character but honestly she's very problematic, what she did on philbert with the submarine scene was not justifiable, bojack was not in a good sate of mind at the time and that sent him spiraling, now what he did in new mexico wasn't necessarily okay either but diane should've approached it differently. thats only one point i have on her i also think that sleeping with mr.peanutbutter when he was in a relationship after she left him was an interesting thing to do she's constantly talking like she's a very emotionally intelligent person but her actions prove otherwise.