human interaction is very simple when you strip away all the indoctrinated bullshit of formality and are willing to see it plainly
people that enjoy talking to each other are going to be friends more or less, if you want anything past that you have to show them more than a good conversation by being willing to let down your walls and let them in
unless you're a stoic man, if you're a stoic man you know that you're both going to keep your walls up anyway and are fine with that, for men like that calling each other fags means they're comfortable enough to know the other can take banter and thus a friend