I don't know enough about all the BhTV participants to argue that it is actually the case

I'm quite sure that there are political participants who would fare worse than Behe on any of the dimensions you'd offer. I guess one could lack the expertise to evaluate more than a subset of participants, however, in which case one could apply the principle consistently..

People find creationism more disturbing than ghost hunters because (among other reasons) creationism is making inroads in the educational system in USA, which could have very serious effects. I'm not sure why I even have to mention this

You have to mention this precisely because it's disingenuous to hide behind the purely non-political justifications of the boycott - you end up trying to draw up a non-political dividing line which just so happens to exclude the viewpoints you have political objections to. This is precisely why I expressed skepticism that there's a non-arbitrary principle for the unique objection to Behe, because if the political considerations are a necessary factor in the boycott, there isn't one, unless one wants to get into a broader defense of one's particular political sympathies... which most people will avoid because they realize that "people who I dislike sufficiently shouldn't be given platforms to speak on" is a principle that isn't going to sway one's opponents.