Have been there. Ultimatly you have to decide who you are. Are you a person that acts to their word (I assume your contract has a notice period). Or decide you

Have been there. Ultimatly you have to decide who you are. Are you a person that acts to their word (I assume your contract has a notice period). Or decide you will act badly if others act badly around you. In my situation I'd gave them my minimum notice and did the job with full effort til the last day. And at least in my case, it was a much easier enviroment once I had handed notice in. You can see the end of the tunnel and toxic behaviour washes off more easily. Good luck.