I didn't say it was my humour. I just happen to know how the expression came to be, even though it isn't covered in the wiki. The wiki aptly explains it's usages
See? It doesn't imply anything other than that RL is not on the Internet. There's no implicit judgement made about people using the Internet.Online
The abbreviation RL stands for "real life", with the meaning "not on the Internet." For example, one can speak of meeting in RL someone whom one has met in chat or on an Internet forum, or of an inability to use the Internet for a time due to "RL problems".