You know that annoying guy who doesn't know you that well but is trying to fast-forward the "bromance" by calling you "buddy"? Oh, you do that? Me too...It's a bad habit and I'm trying to break it.
Coming from the wrong person (for example, someone you don't know well at all) it may get interpreted as a bit annoying or even condescending. It can also be used as a filler when you forget a name and you know they remember yours.
Here is a decent list of names worth avoiding if the context isn't right (hat tip to my fazbook friends):