Huh, that one seems to pass the filter. I think it should be stuck in there with s--t and d--m.
Anyway, I don't think the filter is too extreme. We do get some traffic from Scouts and such, and while I'm sure they've heard the words plenty, we need to set a positive example for them.
That's not to say that there aren't times when I find the best way I can express myself is with explatives but most situations don't warrant their use.
If you do feel the need to use 'dirty' words to express yourself, as you pointed out, the filter only speaks English :).