On my unit, this behavior is not tolerated.
I have experienced it, and will deal with it to a certain extent since everyone (me included) can have a bad day, but if it is consistent, it is dealt with. I had 2 clinical rotations on this unit while I was in school, and there were some staff who were horribly rude and nasty, but they had been fired or quit by the time I started there as a nurse. There are still a few "toxic" people there, but while they are not great coworkers, they are very good with the pts, so I try to let it roll off my back. One person, a nursing assistant, is notoriously rude to other staff, and can be very disrespectful sometimes. I had a difficult time with it at first, but after seeing her with her pts and getting to know her better I have come to realize it is just how she is. I even joke with her about it sometimes. She may not always be polite, but if I really need her for an emergency, etc. she is there. She is great with the pts and family (even the difficult ones, and gets lots of compliments from them). Lately on my shift, we have been very short staffed all around, and tempers will flare. In general though, our unit is a close knit family, and we will always help each other out if we can. I consider myself lucky to be here.
I have experienced units like you have described, and all I can say is that there is not enough money in the world for me to work on a unit like that.
Good coworkers do exist, although there will always be people you don't get along with.
If it is truly unbearable for you, look around for other options. You will find your place.