The posters who insist that ALL/the majority of MN are middle/upper class, earn six figures, have houses worth a million. Very often these threads are underneath a string of threads about benefits, renters who can't afford to buy and people saying what a poor quality of life they have due to ill health, the cost of living, crisis and lack of qualifications and employment.
Oh and preppers who post about storing tins of food in the event of a nuclear fall out amuse me a great deal.