My two cents:
I am not personally hurt when I see this words, but then I was never "in". So calling a Kingdom Hall a Kingdumb Hell does not expose any raw nerve.
That said, those words do have a place, and they do convey meaning.
Jorge Luis Borge said once that, if someone blocked your way while driving, you certainly wouldn't yell "You, son of a woman who lets sinful men use her body in a house of debauchery". Let me make this explicit, as Borges just left it implied: You'd certainly say "You son of a bitch". And there's a difference in meaning. I recognize that, for example, taking your hat off and saying "May you please send my greetings to your mother?" serves the same purpose, sort of conveys the same meaning, but it's not quite the same, is it?
If using those words are somebody's true feelings about the Society, why should he not be free to speak his mind?
I don't like the undertones of "worldly" in JW World. I can bet that the most exquisite language and the utmost respect for the Society wouldn't get me a different label.
Perhaps I can't relate to the feeling of being a Jehovah's witness (or should I say, "one of Jehovah's witnesses"?) and seeing those words said at my Mother. But I believe that people shouldn't have that thin a skin. Free speech is about respecting the right of others to say things that will certainly bother and upset you, not just the things you like. If we censor words lest it offends people, we'll end up controlling the language so that only "approved" ideas can be spoken. Reminiscence of a particular organization, anyone?
I wonder if anyone inside the Watchtower ever thought that calling the Catholic Church "The Harlot" would estrange and alienate potential converts. I'm sure it does, yet they always use it. Part of the attempts at indoctrinating me included seeing my reaction to the Catholic Church, MOTHER, being called that way.