WHY DO SOME AUDIOPHILES TRY TO TELL OTHERS WHAT THEY CAN OR CAN’T HEAR IN A SYSTEM?

I ask the question. Because I have had several discussions on Audiogon where certain posters will try to tell another person what they can or can’t hear in a system. Most of the time never hearing or having experiences either the piece of equipment, cables etc. It is usually against those that spend money on more expensive equipment and cabling. Why is this so prevalent.