Names and faces to bikes

I live in London and have noticed, as I ride through the city on my geared racer of on my motorcycle, the large number of saddo fashion followers riding fixed gear or single speed fashion statement pseudo-track bikes.
I usually shout 'Get some gears you twat' or 'They make gears for bikes nowadays you know'.
Has it not occurred to any of these people that frequently pedalling at the wrong cadence, using excessive pedal pressure and generally straining in thew wrong gear, does serious knee joint, tendon, ligament, cartilage and muscle damage?
I think in a few years we shall see a significant rise in strain injuries leading to damaged joints, early onset arthritis etc.
Yours
a doctor etc

Has it not occurred to you that riding fixed may be really god fun? or, really good for getting a better cadence for when one gets back on the geared bike for longer rides? Do you also sit a Hern Hill shouting 'Get some gears you twat' at the chaps riding round the track? Would you say that to Chris Hoy?
Why have you come on here just to start some greif? We are (genraly) nice people who enjoy riding our bikes. What is your problem with that? Get a fixed gear, see whet the fuss is about. It may make you less bitter.