Have you never been in a workplace before? That is absolutely not what would happen, especially in HN's darling startup atmosphere.
No normal person, being told their colleague was getting married would brush it off and say it's not relevant to the work discussion, and nor should they. It's inhuman and gross. I'm not a robot. I want to celebrate with my coworkers. We spend a lot of time together, playing like we shouldn't get personal with our time is absurd.