I'm so annoyed I could sh*t!

Ahem.

I've calmed now.
I've never actually met anyone like this girl though. She just talks and talks and talks and she has nothing interesting to say and then when you don't make the right head movements and grunts she gets her back up.
She is hands down the rudest person I have ever met, it's as if she doesn't know how to interact with people properly. She's rude to the customers, her workmates, her bosses. Everyone! But she gets away with it because 'she's just like that'.

It's just another thing to add to a long list, but today I made a coffee to take home with me and she shouted across the shop at me 'You're not supposed to make coffee to take home!'. It's fair enough and I didn't know we weren't supposed to but seriously, none of my supervisors were arsed and there's no need to shout it across the shop and then she called me weird to another girl when she was only about 2 metres away from me.

My answer to this is always to walk away, but I really think I'm going to have to say something soon because I don't think I can contain my rage anymore.
She's just such a b*tch I don't know what to do.

Phil has the winning answer here. Probably I would have said something marginally less violent, but she isn't going to know she's a pain in the a*se unless you tell her. And some people will whine and say if she has problems that make her that way you should keep quiet because she can't help it, but like everyone, people with problems don't learn unless you point them in the right direction.