So you admit trophies and cheevos are purely for showing off and bragging rights? Seems kinda pathetic if that's the case.
"Admit"? You say that like he's the secret keeper for the trophilluminati and you just caught him letting out the big secret that will bring it all down. Good work, Sherlock Batman.
Ignoring that that isn't what he said at all and you're calling him out based on something you chose to infer, how could trophies possibly be purely for that one thing? They are a factual record with no inherent value, and any value assigned to them is entirely subjective.
Some people might see trophies as a timestamped record of their games over the years. Nothing wrong with that, it serves that purpose.
Some people might see trophies as a competition with friends. Nothing wrong with that, if that's what they enjoy then they're getting something extra out of their games for free.
Some people might see trophies as inspiration to play a game a certain way that they wouldn't have thought of doing themselves. Nothing wrong with getting extra life from a game you enjoy at no added cost.
Some people might see trophies as something they don't have an interest in turn the notifications off. Nothing wrong with this either, there's nothing lost if you don't care.