He should not censor himself. If a person doesn't like what he/she is hearing he/she can just go somewhere else. Nobody is forcing him/her to stand next to him and to listen to his sex jokes.
And you just deleted your line about "fugly girls" being the only ones to complain... if I'm so fugly for wanting people to be more considerate to each other, boy, there are a lot of people out there that are willing to hit on me anyway, inappropriately.
Or should I just try to drill this into peoples' heads: Nobody should ever have to be the one that leaves a party because they're offended by one person out of tens/hundreds. It's every partygoer's obligation not to be an asshole to others. The asshole can leave or shut up and apologize if necessary.
Easily interpreted as trolling. I think you're doing yourself a disservice.
One person telling another to "shut it" is not censorship. Both have a right to speak their minds. Censorship is when you're told by someone with authority that what you're saying/writing/expressing should not be expressed for whatever set of reasons.
You telling someone to "just go away" is equal to this.
There's a standard in the US that your right to free speech shall be upheld but not in the case of hate speech or insighting unrest and violence (also known as trolling). This is for very good reason (ask Weev what he thinks) - which is that we need some form of law to protect us from one person riling up a mob to violence, or a single deranged person from stalking and harassing another.
Trolling a community to provoke thought and discourse is a time-honored profession that predates the internet by millennia (Jesus is often considered one of the best trolls in history).
Taking a contrary position "just because" or for sport is rude. But it's tolerated. How much of me would you like to tolerate in person? Here, online, I'm just a name in a message thread. In person it's a whole different deal. You have rights to protect you from my thoughts, and I have rights to express those thoughts.
Where the twain shall meet?
It seems especially sad that we're willing to allow the marginal at best behavior of a few be reason that others should have to get up and leave.
Edit: While I'm glad you removed the remark about "fugly chicks", your attitude still enforces an exclusionary environment.
How would you feel if you were at a convention populated mostly by 7' tall gay weight lifters, and one of them shouted "Hey, nice ass!" at you? I bet you'd feel pretty damn uncomfortable. That's pretty much how it feels to be a woman, not just at these conventions, but in the world at large.
Note: I am a 6'1 175 pound male. It's hard for me to conceive of what it's like to be a woman who is 5'2" and 120 pounds... that's why the 7' tall gay weightlifter analogy... it's the only translation that works in my head. Seriously, think about it. They're way bigger than you, way stronger than you, they think you have a tasty ass (or not, but for some reason they feel the need to sexualize you), and you definitely are not interested in them... and they're all around you all the time.
Also note: I'm not actually trying to say real gay people want your ass. They probably don't.