Grown men? You could've just said "adults". You're making an implication you don't want to, I hope, and one which needlessly maligns a whole group of people. That's the same thing pekk was responding to, albeit less explicit. Nobody likes reading "your demographic, specifically, is horrible." Saying it is unproductive and damages the speaker's credibility as someone with politesse - a particularly bad thing in this conversation, given its topic. It is entirely possible to call out ashattery without resorting to prejudice.

But what about young men? Or young women? Or grown women?

While I don't necessarily agree with pekk that saying "30s and 40s" is ageism or discriminatory at all, saying "[people] are never offended at stuff like this" is exactly the problem the tech community is trying to solve with being more inclusionary of other people and cultures. Yes, people do get offended at offensive remarks. No, not everyone sees them a joke.