How long will it last?

I was so fatigue today. My student was making a fuss over tuition this afternoon! She has forgotten she has a session with me. What the shit. And she complainted and screamed on top of her voice at her mother. So what was it? I felt lost completely, not knowing how to react. Should I be angry, relax or...? I mean I didn't have the mood to give tuition today as well. Like hello, who will? Everyone wants to enjoy CNY. But being a responsible tutor, I went to her house and tried my best to teach her. If she doesn't appreciate my effort, why do I still cling onto the belief that when I give in my best, my student will work hard too? For the first time, I seriously know how teachers feel when they encountered trouble kid.
I'm not sure if this is just a moment of thought, I really don't want to care about all these bullshits anymore. If they want to fire me, go ahead, I've no regret. I seriously don't care anymore.