Ask them why they added it. It could be a poorly received joke, or a serious misunderstanding. Until you talk with them assume joke (prior knowledge you haven'

Ask them why they added it. It could be a poorly received joke, or a serious misunderstanding. Until you talk with them assume joke (prior knowledge you haven't shared not withstanding). It's not clear who poorly communicated, and the worst thing you can do is say nothing after having posted here. Part of clearly communicating is catching when you're making assumptions, and asking questions directly to the person to learn more.