I guess I completely disagree with your sentiment that somehow being casual means you're being friendly. Those are two completely unrelated actions. You can be

I guess I completely disagree with your sentiment that somehow being casual means you're being friendly. Those are two completely unrelated actions. You can be casual and a jerk. You can be friendly and professional. Someone telling me "oof" when my business is offline and losing money (or insert major issue you've caused me) isn't a social nicety, it's something I would expect a buddy to say if I told him I lost money playing poker.