What's cool about being called dude?

Or mate? Or anything else?

It's fairly common to be addressed to like this in the US... If you go buy clothes, chances are the clerck there might want to call you dude, or mate like in 'can I help you mate?', or 'looking for something dude?'... I quite can't picture that happening in France, got to say... When they call me dude in the wrong context, they don't score points. I don't expect complete unknown people to adress me like that. I bet they want to be helpfull and nice; they just sound irrespectuous and deceivingly friendly.
It's the wrong way to approach me. Usually I let that known .

Must be because I'm not cool I guess.

Keep that 'dude, mate' crap for people you really knows.

Louis,