Intersting point.
Typically speaking one does not coose one's skin colour, sexual oriontation, social origin or country of origin. This means a referential or form of address based on that is 'unfair'.
Obviously a JW can be born into the cult. But they can also leave. You can't stop being black, gay, or Irish.
Thus Organisational slams like;
- bOrg
- Jehovah's Witlesses
- Fetid Deoderant Salve
- KingDum Whore/Hall
... are fine, just as 'neo-nazis' is a perfectly proper form of reference where applicable. Damaging, wrong and corrupt institutions deserve to be referred to as such. Just because more people think JW's are 'mostly harmless' than think neo-nazis are 'mostly harmless' doesn't mean JW's don't waste lives, lie and do harm.
'Hey, Witless!', 'Oi! JeHovis' (Hovis is a brand of bread in the UK) et. al. are direct forms of address for individuals.
I tend not to use them for individuals unless they piss me off, in which case *shrugs* it's not a major moral quandry for me. I have a potty mouth maybe, but who care's what comes out of the mouth of someone like me?
As JW's use JayDub themsleves, we can too.
'Dubbie' is a diminutive of this. If someone doesn't like it they should argue with the English language and how it forms diminutives.
God, in Dutch EVERYTHING can be a diminutive; de oliphant -> het oliphantje, de man-> het manchje (not to sure about the spelling of the last - the diminutive tage is '+je' or '+chje' phonetically speaking, and varies according to the word).