I don't feel that wpie's example was the best or even a good illumination of what he/she's trying to say, but the concern is legitimate. And saying, "If you feel uncomfortable, get out of the bar" is exactly the type of response that keeps making it hard for women in tech (and other subgroups in other groups). Would you say, "If male programmers make you uncomfortable, don't learn to program"? If you would, then that is part of the problem.
> Feel unsafe about what? Their safety? Those guys made two harmless dick jokes while sitting in a room with countless other people.
It's not really about one joke. It's about reinforcing a space that makes it easier to legitimize misogynist behavior through carelessness. Like you said, "in a room with countless other people"--these guys were in a professional setting, and the joke really had no place there. Maybe they didn't deserve to get fired over it, but it definitely was not the right venue.
> If I want to tell a blasphemous joke, do I have to take into account that someone could feel offended and fear for their safety because this joke could mean that I want to harm religious people?
Is that religious person one of very few religious people in a group of non-religious people? Then yes, you do. Your one joke will not make them think you are about to hurt them, no. But it will reinforce a space that makes being religious an easy thing to ridicule, and it will increment the fear counter for any particular person in that space, and more importantly, will legitimize the attitudes of the other non-religious people around you who might have otherwise not done their part in contributing to a hostile environment. Luckily for the religious, they rarely are in a position to be uncomfortable (well, unless you're anything but Christian in America), but if one of the goals of the space you are in is to make it a welcoming place for people of talent, religious or not, then telling blasphemous jokes is (obviously, I hope) not a way to do that.