The claim is always that the person to be "outed" is a hypocrite for being gay while supporting a supposedly anti-gay measure. Problem is, most of the time, the measure that triggers the outing isn't really anti-gay. For example, is it necessarily "anti-gay" to oppose gay marriage? (I suppose a truly bigoted person would ALSO oppose gay marriage, but I know plenty of non-bigots who oppose it, or who want a few more years to think about it.)
That problem aside, these "outers" are hypocrites. "Privacy rights!" They refuse to accept that a few -- very few -- conservative public figures may indeed be gay and KNOW it, but still believe that many aspects of the liberal "gay lifestyle" are morally wrong.
As for me, I tend to support some sorts of gay-marriage-equality measures ... it's just that I refuse to tag those who disagree as "bigots" or to try to sniff out which of them are themselves gay. As the article points out, those aren't ways to win votes. They are hypocritical, blackmailing tactics.