Gawdon Bennet! I'm not sure abaaaht da filter thin' - doesn't IPB allow da user ter select whether da filter is applied ter their viewing? I work in a bar fer goodness sake, I only 'ear words ov Roarf le'ers long! (You know.. Pint, wine, shot, nuts - obviously). OK?
Sorry - But yes, I'd say that it needs to either be switchable for each user, or that the replacement terms are understandable to everyone without it being offensive. Maybe just Cockneys understand these terms, or all Londoners, maybe even everyone from England - but I certainly haven't the time or energy to decrypt some of the sentences appearing with a Cockney Rhyming Slang dictionary.
Oh - And the gay thing gets my back up a bit.