I don't think I've mentioned hobbies in a past post, but if I did, I probably would just say 'hobbies' rather than the actual names of them. DH, DC & me all have genuinely unusual (and mostly different from each other) hobbies. I would worry that someone I know might post on here, and then know who we were from the hobbies. Equally, two of us compete in our hobbies, and there are only a handful of people in our county doing it - and there are references on the internet to us due to competition results, so we would be traceable, even by people who didn't know us.
Of our hobbies (we have 8 between us all) only one has been mentioned on here, another could be considered usual though not mentioned here yet, and the other six haven't been mentioned at all, and most of them you'd be very unlikely to guess. My DH is not a MAMIL, nor a golfer or anything like that, thankfully.
I know we have a lot of hobbies, but we work hard & play hard, and I spend a lot of time driving DC around to their hobbies. Somehow we fit it all in - if anything, my DH gives up time when he could be doing his to do his part in ferrying DC about. DH probably does his the least often - DC & I do ours pretty much a couple of times a week per hobby. We don't smoke, drink (excessively!) or socialise much, or holiday abroad, and we live pretty careful lives - our spare cash goes on our hobbies.
It is absolutely not a stealth boast (hence why I've never mentioned them before, I don't think), but an effort to explain why I would never say what they are.