No ones music is superior people just listen to music for different reasons.
Pop is simple and repetitive because it's meant to be catchy. Most people who listen to pop listen to it for the lyrics to sing along to, or to dance to. And new pop songs try to make interesting new sounds that people like.
Metal on the other hand people listen mostly for technical ability with instruments. Although it usually starts as just preferring the heavier style of music, metal seems to differ less in terms of style than many other genres. Most metal bands follow the same formula of drums, 2 guitars, and a bass guitar. And although there are lots of bands that change it up, there are plenty of bands that sound almost identical. As a result metal fans usually look deeper into the music and listen to how complex and well composed a song is rather than the overall sound.
It's all what you want to get out of your music, no music is "superior". As for dealing with non-metal heads, if a person is open minded about music I'll usually share some of mine with them, if they don't like it I'll leave them alone. Sometimes other people have interesting new music for me to listen to as well (other friends have gotten me more and more into jazz) and sharing music is awesome when you both are open to new ideas. I once knew a girl who was into pop music, but also appreciated the complexity of classical music, and got her to like various metal bands with clean vocals.
So if you want to share your metal with someone do it because you genuinely think they will enjoy and appreciate it. Not because they listen to "inferior" music and you need to "convert" them.