@IEatWater
English must not be your first language, or maybe you're just a bit special.
Instead of revealing that you are what you are you could have just googled the terms you don't understand, but I guess the inability to do that combined with the willingness to complain about it is just what makes you the unique individual you are.
I'm aware it's a derogatory term for some, but that's what they see southerners as, though many don't mind the use unless certain people(like you) use it, because you genuinely see it as a negative thing.
"Not pissing on someone even if they were to be on fire" means that you feel so much disdain for a person that you would not even help them out in such a humiliating way because you'd rather have then suffer even worse. It's just a saying that shows extreme disdain, something you could have figured out with a simple google search. But you're actually the first one I ever met who did not understand it, I'm assuming you're somewhere on the (functional?) range of the autistic spectrum.
A northern urbanite is one from an urban (-> city) area from the north of America, it's usually used to describe people from the coastal urban areas or the great lakes region.
The south lost the war, maybe you should read that comment again if you think I was talking about the north there.
Danger hair refers to people, usually women, employing aposematism. If you think about it for a minute or two I'm sure you can figure out who the usual candidates there are or you can just google either term if even that does not help you.
Those aren't particularly big words, you just aren't particularly educated and really shouldn't talk about others having no idea what they're talking about after that embarrassing display.