if you are too friendly to people they think they can be assholes in their and that you won't do shit about it.It happened to me quite a few times that a dude come to the door to offer me a drink, than afterward he starts a fight and I throw him out, then he is mad a me because he tought we were friends
it's either that or working at the local mac donald or as a garbage collector with their "qualifications". What job would you pick if you were in their shoes.