Olly's got a couple of good points, but still I wonder what ever happened to the concept of Common Decency?
Forget talking about racism, sexism, homophobia, etc. Forget the PC thought police and all that. Surely, certain language raises the specter of these societal issues, but that's beside the point.
What about just not saying things that hurt other people? Are we so bent on being funny, sarcastic, or free to say whatever we want that we forget about common decency? It's not a matter of policing your speech, it's a matter of not adopting hurtful speech in the first place.
I think there's 2 separate issues here
a /politeness in daily communication which is one thing
and
b/ what can be expressed through comedy - which can be entirely another
because lets face it, comedy where everyone is NICE is fundamentally BORING ie NON-COMEDY. The key is how to be edgy without crossing the line but the problem is "the line" itself remains undefined...
You are probably aware of this, having spent time here but it also cuts to the core of British identity too - humour, self-deprecation, irony is what defines us, and ultimately what sustains us through what at times can be an extremely depressing country to live in.