Your rebuttal is not a rebuttal, nobody is claiming that “every bad thing or territorial war, even of conquest, is a genocide”. People are claiming, and are being backed in said claim by several governments, international organization, the UN, and the world court, that this particular thing is a genocide.
I cited an 85 page filing at the ICJ, and claimed that several governments, international organization, the UN, and the World Court has claimed this particular thing is a genocide. If you google “Gaza genocide” you will find all these claims in the first page of results. You may even find the 85 page filing (but in case you don’t, here is a link[1]).
There is a whole Wikipedia article dedicated to this subject[2], my claims can all be found there, particularly in the section titled: Statements by political organisations and governments. Finally, if you still in doubt, I’ll give you one more source, in particular where the UN is claiming that: “there are reasonable grounds to believe that the threshold indicating Israel’s commission of genocide is met” can be found in a report by the UN special rapporteur on the situation in Palestine[3].
1: https://www.icj-cij.org/sites/default/files/case-related/192...
2: https://en.wikipedia.org/wiki/Allegations_of_genocide_in_the...
3: https://www.ohchr.org/sites/default/files/documents/hrbodies...
Not every bad thing or territorial war, even of conquest, is a genocide.