When out at dinner parties or BBQs and you then bring up the topic of being a frequent flyer and start comparing status, points, points earning, flounges, SCs being more important than points, going the long way vs straight line for SCs, comparing J seats, comparing flounges, priority boarding working or failing, WP/OWE treatment on the non originating carrier, lounge facilities (showers, amenities, champagnes, food etc), credit cards to maximise points earn, mASAs, hotels, hotel status etc etc ... it goes on and on ... then all of a sudden you realise the sickness has set in and the group of people you were talking to has slowly moved away.
But on the rare occasion you do find a kindred spirit where you can share your experiences and then it seems all worth while and the World returns to normal.