Well some of us like to support the team, not mention they are one of the if not the best team on the planet. How do you think they would feel when they put out performances week in week out yet the stadium remained silent because apparently most City fans won't according to you, while other teams who don't produce half of what City do get to play in front of a much better atmosphere.
Even if none of this make you feel any different, I really don't see the fun in being sat in your seat for 90 minutes (I'll give you the benefit of doubt) in silence. The big problem here isn't your refusal to contribute to the atmosphere it's the fact you are actively speaking out against people who actually are.