I agree with you completely. I was thinking about it the same way. It shouldn't be so hard. But then it hit me. Maybe, in fact, it is if they pretend to be something they are not and if normally they don't talk normally.
You know how they say for people who swear a lot. In their speech, the curses are left and right, almost every third or even second word. Even most often not aware, they are suffering in fact of lack of eloquence. Their vocabularies are so small that they have to fill the sentence with something, to leave the impression of importance and knowledge. That's why (mostly in real life even not so rear anymore on some other networks) we got something like:
"Dude, when I was f**king walking down the alley that f**king garbage can, dude, some mother f**ker left in the middle of the f**king sidewalk, hit me, dude, as I was watching dude, some bitch, f**k you got to see her dude, across the f**king street. You know what the f**k I mean, dude?"