While Bill Maher may or may not make good points, I'm not naive enough to think that he's discovered some sort of thing intrinsic to everyone with a penis, nor to think that he has some great insight on sex, sexuality, gender or much of anything else.
I don't work all day with "a bunch of other men". From a literal standpoint, my workplace is about 1/3 female. It's a small shop, but out of the 4 people writing code there, one of them is female. Even if that wasn't the case, it wouldn't be something I even thought about too much, because when I deal with people I tend to view them as people, not as points on a gender scale.
Maybe I'm just much more left-brained than most people I know. I get absorbed in my work, and I get absorbed in discussing it with peers, regardless of their ... well, anything. A large part of the time, I don't know if the people I'm talking to in those discussions are male or female or whatnot. Their sex is, frankly irrelevant when it comes to the stuff we're doing. Variety and diversity are good to have, but I don't think humans are so static as to be boring because of a ratio skew. Because they're people. Not genders or sexes.
I'm not "apologetic about my manhood". I'm "someone who treats humans in the same manner unless they give me reason not to, and calls out pointless things when he sees them". I also do not happen to fall very much in line with western male stereotypes. I never have. I was not raised in anything near a home that thought that feminism, particularly the more recent waves of feminism, had any sort of legitimacy, I know about that school of thought, and others that have had influence on me because I read a lot of books as a kid.
Something being sexist doesn't mean that someone is necessarily consciously or purposefully stomping on or belittling some other group of people. It means that there are needless disparities about something based on sex. Thinking that a conference would be better just because it had more women or less women or more men or less men or more hot vapid men or women or more people of sex B for no reason other than because there aren't any there is sexist. "Sausage fest" has pejorative terms. It's normally used to refer to keggers, not hackathons. People who go to keggers at least can know that part of the reason people go to alchohol-fueled parties is to find sexual partners, giving at least a reason for the term. Not hackathons.
There's nothing intrinsic about having a penis and testicles that makes me less of a person if I don't fit into the behavioral profile of the ideal western male. There are 7 billion people, even assuming biological trends in behavior directly linked to sex that are unaffected by cultural pressure, that's more than enough for it to be ridiculous to try to shove all of any group of people into an absolutist box, and tell them they sound like they feel sorry about some intrinsic thing about them.
If you're getting bored just because someone with different jibbly bits isn't around, I would suggest finding something that isn't so boring to do. The world's a fascinating place.