As we all knoow it's quite normal during loading to feel some "bumps" so unless it was a really hard hit I'm not surprised the AF crew didn't realise.
We also also know from other incidents crews might not necessarily feel light impacts in the cockpit.
The only thing that puzzles me is how the crew immediately dismissed the fact they might have hit something.
I'd definitely be asking ATC to confirm it was definitely my aircraft that was suspected of hitting the Air france & who reported it etc. And would definitely be asking the crew if the felt anything strange during taxi, which for some reason they didn't tell us