I really get annoyed when a customer of mine just stalks me on CS, constantly commenting after me. I sometimes just hang out on miscellaneous topics on CS until an art customer suspiciously comments after you. Once you start being on another topic, that customer just follows you. Seriously, I just don't like to be followed by a customer, even if its nothing to do with the art that I owe to that person. I really need a break, but I still have unwanted people around me.
I guess it sort of relates to customer =/= friend.