i dont know... maybe the fact she is predatorial cougar who preys on students.
maybe the fact she raised tybalt so she shares the blame for well everything he does and/or is and thats a lot
maybe the fact that she is more than happy to fuck MC in her own kitchen after finding out you date her daughter
maybe the fact that she was cunty person from ep 1 until 11 and everything she does is wrong and/or ilegal, yet when stephen has enough and files divorce she acts as if she is victim in all this
maybe the fact that after all the bullshit she is making the divorce process such a nightmare that its mentally affecting sage... "her daughter"...
i could probably make up more reasons if i try hard enough