I tend to agree. Some parent asked me if DD (not a good chess player) would be at the school chess tournament, and I said no, in part because she had a swim meet that same weekend. And that was clearly the wrong thing to say - I felt I had to immediately follow up with the details that it was an informal thing that the swim school did for fun, with no times kept and everyone getting a ribbon.

We have a colleague who talks about his kid's soccer talent, but it's clearly a parent-brag in a context where parent-brags are appropriate. None of us have similarly-aged, or similarly-interested kids, and it's brought up as the kind of thing you really can't share anywhere else, because it would be bragging.