It's called instilling doubt. People do this all the time ... and not just in audio. Usually, it is people who don't know what they're talking about. Sometimes, it is done out of jealousy and envy. Sometime's it is just innocent banter. If you're a seasoned audiophile (which you are), you not only can hear, but you know what to listen for. Your friend with the mid-fi headphone system does not. Your ears are more experienced than his ears. Listen to your's ... and perhaps get a new friend.
Happy listening ...
Frank
Happy listening ...
Frank