Coming from the UK and in my experience in writing to people on-line, it seems that some cultures that use the English language do not understand that ellipses in communication can come across as sarcastic or gloomy, or a variety of other feelings that usually feel negative to the reader.
I’m sure I’m not alone when I say this but I usually find dependent on content but most of the time coming across as negative that the use of ellipses in instant messaging is rude.
What is the bottom line? I hope there is an answer to this...