He is displeased by the fact that there are people who dare to give voice to those who are labelled 'conservative' or 'right-wing' by the talking heads in the corporate press, thereby acquiring a taint in the way a Linux kernel acquires one by giving space to non-GPL modules: "if you listen to those people we will not take anything you say seriously because you're tainted".
I happen to agree with the tainting mechanism in the Linux kernel but I vehemently disagree with this type of political tainting.