Quitting without notice is not only perfectly acceptable when you’re dealing with a hostile environment, it’s a really good idea.
While it can feel good knowing that you’ve put in your notice and you won’t have to be there much longer, it can also ramp up the stress and pain as you try to drag yourself into Hell each and every day trying to complete your term. Moreso if you have to worry about what kind of bullshit your boss is going to throw at you just because they were already huge assholes and now they’re angry with you.