I really don't appreciate the ageism in this comment. It's unbelievable that in this industry you don't meet 20-something asshats so that you have to single out people in their 30s and 40s.
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.