It does sound like someone has a problem with self-righteousness. While I do think that Christians can make politics an idol, there is a lot of ground between that position and no political involvement. As Christians, we recognize that the solution to the world's problems is the Gospel of Jesus Christ but that doesn't prevent us from being involved in earthly politics.
How do you deal with people with inflated senses of righteousness? If you figure it out, let me know. I have had a couple of such encounters and they have not ended particularly well. I have learned one lesson, though. If you learn of a Christian who used to be friends with lots of people - look out - he or she probably someone to avoid.
True, and I would add this: Jesus uses "the body of Christ" as an analogy on purpose. A body has many organs and many limbs, and they ALL HAVE DIFFERENT functions within the body. Some are called to politics in some form or fashion, and some are not. Dittos with foreign missions. Dittos with being a pastor. Anyone who says any differently is just wrong.