The team of which I'm a part is having an away day (well, an away afternoon) instead of a traditional Christmas night out. The activity that has been chosen by the organiser is go-karting at a local track. This is not a great activity for me - I have mobility issues and am currently undergoing tests to see if I would benefit from spinal fixation as I have Chiari I malformation caused by hypermobility / Ehlers-Danlos syndrome, so taking part in something with a risk of being bumped about or driven into when I already have an unstable spine and am looking at possible surgery would be a bit irresponsible. Not to worry, I willingly volunteered to stay at work as normal and be the person on hand to deal with any urgent issues that crop up, rather than a member of another team having to do that on top of their day job. My manager is fine with that arrangement.
Since it became known that I'm not taking part in the away day activity, the woman who organised it has been a bit 'off' with me, but nothing I could really put my finger on. It's now got back to me from a reliable source that she has been making comments, both to other colleagues across the department and apparently on FB (I'm not FB friends with her but some of the team are) about 'people who aren't team players' in the context of the away day - apparently she had a plan for a team competition and the fact that I'm not going has thrown the numbers out - and 'fun sponges who think they're too good to join in'.
I haven't made a big thing of my tests and possible surgery, only my boss and one other person in the team who I'm reasonably close to know about it, although I do have some specialist kit at work as a reasonable adjustment so it wouldn't take a rocket scientist to work out I have a bad back or similar. I don't really want to have to share the details of my private medical issues to justify why I'm not going - when one or two others have asked I've just smiled and made a joke along the lines of "oh you'll all be much safer without me there, you've never seen me drive have you ha ha, I hope you all have a fab time". I don't even know why this woman's comments have bothered me so much, I'm usually quite good at brushing off stuff like this on the rare times it arises, so I don't know why this has got under my skin, but it has. AIBU to be annoyed that she's bitching about me behind my back about something so petty?