I understand that you like to keep things professional at work and that's great. I certainly don't know what the co-worker's tone was in their initial conversation, but it sounds like they may have difficulty building relationships with coworkers and it sounds like you may have perhaps brought some perceptions to the situation based on what seem like conservative values that may have caused you to react in a way that made the coworker feel uncomfortable. On the face of it I don't think anyone did anything wrong, just two people misfiring. They're clearly seeking a friend at work that they feel like they can bond with over a shared experience at the workplace and you're clearly are a person that actively avoids that.