As long as they don't use it every other word I don't care.
How anybody can be offended by a word like "fuck" is beyond me, I read somewhere that fuck is an abbreviation of fornication under the commandment of the king, so if he wanted a large army but only had a small village he would command people to have kids to increase the population and get his army. It has now taken on this offensive meaning but I doubt anybody could say why they are offended by it.
The old saying, "sticks and stones can break my bones but words can never hurt me" says that no matter what I say I can't hurt you, so how can a word that no longer has a meaning (that word is "fuck") hurt you?
Any word could have these connotations, take the word "chav" for example, 20 years ago you have got a funny look for saying it but now everybody knows it's an insult.
I don't think any word should be able to make adults be shocked at you or say that annoying sentence "watch your language" or just "language" (to which I say in a very slow and deliberate way ENGLISH).