Its not about holding others to compartmental standards. Its about the standards one holds themselves to. If someone considers a certain type of language sinful, and unbecoming of Christians, then it is universally sinful; and as such, that person should shun all instances of voluntarily indulging in its occurrence. If it is not sinful, then why is it sinful for a pastor to use it? If it is sinful, then why would one otherwise watch, listen, or read such for entertainment? It doesn't make sense. For instance, most Sabbatarian's not only consecrate the Sabbath (or Lord's Day,) but also do not go to any place that desecrates it, i.e. shopping, restaurants, etc. Why? Because something that is sin, is sin regardless if the world disregards it. But, if we openly engage or partake in what we consider sin, can we righteously judge another for it?
And I agree, most certainly there are Christians who hate even the sound of vulgarity entering their ears; and they have every right to form a distasteful opinion of those who use such. But those who act shocked when a pastor uses vulgarity, then pop popcorn and soak it up for couple of hours, have no room to talk about people who use it, pastor or not. The thing is, those who disagree with the latter are simply not willing to give up their entertainment to be non-hypocritical in their pseudo-outrage. And that is the reason, knowing most Christians, do in fact indulge in all sorts of worldly entertainment, (which will include said vulgarities), renders a majority of that outrage artificial at best.
People can deny it, but nobody is fooled, most likely including Doug Wilson. And also, this hypocrisy is most likely one of the reasons certain Puritans had a problem with stage-plays and secular poetry in their day; which would be considered harmless compared to today's PG movies, music, and books. Because if you are going to consider something ungodly, you don't get to be entertained by sin just because its source is sinful, nor do you get to divide your eyes and ears between edifying and not edifying, nor do you get to excuse your voluntary consumption of it by "but they're not Christian." It isn't about them, it is about your standards as a Christian.
I just recently voluntarily watched an R-Rated movie. How am I going to get mad at Doug Wilson for saying boobies?