To some extent I agree with you. But I think there are lots of reasons for this.
For some people (like me) it will be because they have been concerned with ME politics and the situation in Israel and the Palestine question for many years. . I have watched this ongoing situation since I was a teenager, and I'm now 52. This conflict has a long history.
For others it will be that this is the most covered war by mainstream media. Israel matters to the establishment, it will find its way into mainstream media.
For others, it really is that not only is the situation in Gaza so horrific, but that this has all played out on SM and there are now thousands of pieces of evidence all out there for all to see. Its difficult to ignore, much less deny, unless you really are ideologically wedded to the idea that people have a right to go home generations later and grab land. In which case I will hop off back to the pale of settlement and chuck out some Ukrainians (I can't trace my family back as far as 1099 to Israel).
For others, they are using this conflict as justification for taking their masks off, no longer seeing any reason to hide their antisemitism. They can say "risky things" on X and get away with it.
None of the above really applies to Yemen.
It is wrong to suggest that all people are only interested in speaking up about the plight of Palestinians because they hate Jews. It serves no purpose unless you just want people to shut up and look the other way.