Even completely ignoring all the history of the region and how the current State of Israel came to be and only focusing on the present in a vacuum, there is still is a glaring contradiction that I have never heard any sort of coherent answer from people who support Israel’s actions: If you truly believe that simply having a negative opinion of Israel’s actions against Palestinians is antisemitic (or simply being a Palestinian that’s still alive is antisemitic according to too many people), then surely it also holds that both Israel’s outright killing of Palestinians and their ongoing apartheid policies preventing Palestinians from existing in the same areas as Israelis is anti-Arab right? Is being anti-Arabic somehow preferable to being antisemitic? Are Arabs not human beings and do they not deserve the same rights and protection as Jews or literally any other human? What makes it okay for Israel to be anti-Arab then?
One of the half baked arguments I have heard is that Israel is "justified" in being anti-Arabic because "it's in self defense against Palestinians that want to kill them," but if you make that assertion, then what makes the other side different? Israel is certainly not just attacking the Hamas and there have been more Palestinian civilian victims than Israeli civilian victims so wouldn't you saying that also automatically imply the inverse and equally justify the Hamas' actions against Israel? You can't attack someone while claiming self defense and then cry foul when they defend themselves against you.
Israel is committing a genocide. - At best, one would have to concede they're killing thousands of children to get at a handful of Hamas members. If you call it antisemitic to point that out, you're saying genocidal kid-killing is inherent to Israelis - which is about as antisemitic as it gets, and a damn good justification for wiping Israel off the map. It's a moronic,monstrous line to push.
(Not disagreeing, but offering a bit more insight)
To be fair, what the IDF is doing is hard. Fighting irregular forces in dense urban environments is hard, especially with their opponents having hundreds of underground bunkers and using civilian shields. Even if they were operating under best practice, there would be a lot of civilian casualties.
However, they aren't operating under best practices. I don't know how the average IDF soldier feels, but the top brass at best doesn't give a shit if they kill a hundred palestinian civilians per one Hamas member; At worst, they see this conflict as an excuse to actively target them.
Between the genocidal rhetoric of Israeli leadership, the fact that Israel propped up Hamas over the PLO, and the fact that the casualty stats are squarely in line with the broader civilian population, what makes you think any attempt is being made to avoid civilian casualties?
Hamas and combatatant-aged men aren't over-represented in the casualty stats - this is just an indiscriminate genocide they've been clearly signalling they intend to commit.
Fun fact; something like 60 percent of all Israelis are Mizrahi Jews from across the Middle East. Both in terms of their physical appearance and their material culture they have far more in common with Arabs than they do with white Europeans. Calling them "white" really doesn't hold much water.