Swearing?

Would you consider "I have been feeling really shitty lately" swearing?

Oh noes! You said a bad word!

Seriously, though, the "swearing" taboo is bullshit. Individual words carry no power, it's the message conveyed that has an impact. By telling someone they aren't allowed to say certain words, you are attempting to control what they think. That's far worse than the imagined wrong of using certain words.