I think its sad when two people who cannot ride a bicycle, haven't got a clue about how bicycles work and for some unknown strange reason hate bicycles, spend half their live's trying to tell people who know how to ride a bicycle that they don't work! That is really sad and really weird.
What is even sadder is people who assume as evidence. For example, I know a lo about bicycles, just like I do about the quackery called "liver flushing.
By the way I have been riding bicycles most of my life and was over 21 before I even got a driver's license because I rode my bike everywhere. I still did not buy my first car until I was 25. I used to do cross country bicycling and triathlons and would tear down my bikes o the last bearing and rebuild them before tours and races. I still have an 18 speed touring bike and a 12 speed racing bike. Point is that you ought to be more careful about assuming what people do know.