Exactly. It's not about how many, it's about who was killed and with what intent and rhetoric.
If there was any safe number of an ethnic minority countries were allowed to murder before it was officially a genocide triggering sanctions under international law, you can be sure some countries would be killing that many minus 1 every year.
The problem is Israel has realised there may be no number of Palestinians they can kill that will cause any meaningful pushback by the West.