I don't think swearwords should be considered bad in any way. What's the difference between calling someone a (female dog) than calling them something like a "butthead" which my sister calls me all the time, or an "idiot", or a "moron". Usually they actually aren't, so there's no difference to me.
However, I don't swear. At least, not loud enough for anyone to hear. I have never swore loud enough for anyone to hear me in my life. I swear  I whisper or think them sometimes, but never speak them aloud.
If you want to filter those words also filter someone saying "you idiot. you're so stupid." In my opinion, it's only society that has made those words bad.
The f-word was not originally a bad word. It just meant "sex". (is that filtered?  ) But then people used it aggressively, and it became a "cuss word."
D--- onlt means curse. Why can we say "curse you" but not "---- you?" They're the same thing.
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