That would ring true if the persons asking for a middle ground weren't expressing severe concerns of distress, and the point you defend was somehow meaningful and essential. When the side you defend is "I want to tell dirty jokes in public" and the other is going "I am reminded of rape threats because we have proof that people in similar settings tend to commit hostile behavior", your side doesn't come up very sympathetic.

> Are you really saying that I can't tell jokes to my friend for the fear of offending an eavesdropper?

In the middle of an ongoing talk at a conference??? No, you can't tell jokes there that can be overheard (why wouldn't you just whisper to his ear?), as you shouldn't do it at the cinema while the movie is going on. That's called basic respect - the other people went there to listen to the speaker and do some networking. Or if you do, the least you should do is have the decency to apologize when someone else tells you off.

> No, I am not willing to watch my every word for fear of triggering an eavesdropper.

You can tell jokes to your friends at the pub, or at the office café, or any place where social rules are relaxed. That's not being PC, it's common courtesy to adapt your behavior to the social setting. If you can't or won't control your behavior at more formal venues and distinguish where it's proper to behave informally and when it's not, people would be right to avoid being around you.

Social rules are there to avoid friction, and allow everyone involved to find a compromise they can live with. You are not entitled to behave as an insensitive asshole, in particular when people is asking you to stop. You can legally do it, but it doesn't mean it's morally right. There are venues where you can tell bad jokes to your friend, please limit yourself to doing it at those places.