I believe the term 'slf' was being used by Uncle Roger in 'Flight' magazine 20 or more years ago. It at least has the characteristic of being well used!
Personally, I don't mind at all being 'slf'. I do mind rudeness and poor service from the airlines, though. So I have a 'black list' of airlines that don't get my business. Additionally, all the stories about the inconvenience and yet continuing inadequacy (and in some cases, downright stupidity of those supposedly enforcing it) of airport security in the US puts me off the thought of flying there. From traffic figures, it would appear a lot of others think the same.